Engagement Rings & Custom Diamond Rings.
Custom Crafted in Toronto.

Honest, one-on-one advice and service.

Diamond Engagement Ring

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The Best Custom Jeweller in Toronto

There’s no better way to celebrate your unique love than with an engagement or wedding ring, pre-designed or custom-made from Jacob Mercari. Our experts will create a precision-crafted custom ring made exclusively for her, using only GIA-certified ethically-sourced diamonds.

Enjoy a friendly, relaxed, and pressure-free environment in our Toronto jewellery store knowing that you can’t make a mistake.

We guarantee the best possible pricing. If you find a better price online, we will match the price for any ring, gemstone or diamond of the exact same quality and weight.

You’ll be amazed at how easy surprising her with the timeless custom or pre-designed engagement ring of her dreams can be. That’s the Jacob Mercari Promise.

Need Help Designing Your
Dream Engagement Ring?

Book a Free 30 Minute Design Consultation with one of our Wedding Ring Designers.

custom ring outline

Google Verified Reviews

Five star service all around. I was very pleased with the professionalism Greg showed in our meetings. I felt very comfortable throughout the process and knew that he had my best interests at heart. Ring came out perfectly.
Carolyn Buckman
Carolyn Buckman
15:46 02 Jan 19
Greg was amazing to work with. We had no idea where to start in our engagement ring search, but Greg was very patient and took the time to show us a lot of loose diamond options to choose from. We found the perfect diamond and designed a custom engagement ring that we are absolutely in love with! Thanks again!
Samiya Jahan
Samiya Jahan
16:19 14 Dec 18
We were drawn to Jacob Mercari because of the way the company is run with a commitment to ethical options and charitable contributions. This approach and shared values got us in the door. Once there we were blown away by the experience, the customer service and the ring - it was easy, straightforward, pressure free, and enjoyable.Greg was a pleasure to work with. His communication was constant and timely and he always stayed after hours so that we could meet on our schedule. He has a very genuine approach, not salesy at all, and you could tell he was knowledgeable and very invested in us and our happiness.He also ensured that the ring was perfect - which included looking at our pictures and helping us customize and build the ring we wanted and also sending it back to the lab when he knew the first version wasn't exactly to our vision. This attention to detail, and his client first approach, was incredibly appreciated. We would definitely recommend, and will be going back for the wedding bands as well.
Zachary Ortmann
Zachary Ortmann
22:07 01 Nov 18
Greg was quick to answer our initial message and organized a meeting promptly. Greg is not there to try to pressure you in to a sale he really wants to get to a product that you like. My fiancé and I got to customize our ring and opted for a lab grown diamond. It turned out perfectly and Greg could not have been better to work with!
Sam Ives
Sam Ives
18:37 01 Oct 18
We went to Greg as a couple have a custom engagement ring made, and could not be happier with the final product or the process, which was easy, enjoyable and we really had fun with it as a couple.Greg made us feel comfortable, responded promptly to our questions, and made sure we were involved at every stage. He is extremely knowledgable, and best of all, was willing to share his knowledge with us.The end product is a stunning ring that has completely exceeded our expectations. It is a unique piece that we could not have found in any commercial stall. Greg provides wholesale prices and is very transparent about costs, so you can be sure you are getting the best value for your money. We have already been back to have our wedding bands made.I would recommend Greg to anyone looking for a unique, beautiful and timeless piece of jewellery for the person you love. Thanks Greg 🙂
Lizzie Stewart
Lizzie Stewart
23:11 30 Sep 18
I recently purchased a custom engagement ring from Gregory at Jacob Mercari. He made the entire process easy from the first consultation to the day I picked it up. I appreciated the time he took to explain the characteristics of the diamond and overall ring design. The final ring looks spectacular and my fiance loves it. I would definitely recommend contacting Gregory if you're in the market!
KEVIN Neverson
KEVIN Neverson
18:31 23 Sep 18
Greg was a pleasure to do business with. I initially contacted him for a consultation on a custom engagement ring and he was very accommodating with regards to my schedule. The consultation had a nice relaxed zero pressure atmosphere and Greg was very helpful and knowledgeable about the diamond selection. He was very enthusiastic with regards to incorporating my ideas into the ring's design and you could tell that he loves his work.The final product turned out better than I could have hoped. I would highly recommend Greg to any of my friends looking to have a ring made. Will definitely return to him when it comes time to have wedding bands made.
Paul Jean
Paul Jean
02:16 03 Sep 18
A better experience than I could have expected. Greg was a pleasure to work with and incredibly knowledgeable. I came in with sentimental piece that I wanted to convert to an engagement ring. Greg took the time to make sure I understood the process and all of my options, and working together we came up with a great design. Greg kept me involved through the entire process and I was blown away with the results. My fiancée and I could not be happier with everything, and look forward to working with Jacob Mercari again.
Matt B
Matt B
15:47 25 Aug 18
This is long overdue but, i had a great time working with Greg, his repsonses are prompt and the whole transaction from choosing the diamond to custom making the setting was smooth and professional. My fiancé loves her ring and we will visit Greg shortly for our wedding band. Overall, great pricing and customers service!
Sam Liang
Sam Liang
19:06 10 Aug 18
I was actually skeptical when I saw that Mercari had all 5 star reviews. But now I completely understand why... Greg is simply incredible. I've had custom jewelry done before, but Greg's work is beyond what I could imagine a jewler do. He doesn't just do as you say (and does it perfectly), he also makes suggestions on how to do it that makes the piece incredible. With his help, my husband designed my engagement ring which I receive complements on a regular basis. He also made our bands, which were simply incredible as well. I also trusted him to make custom cuff links for my husband and he delivered yet again, perfectly. And when I say perfect, I really do mean perfect. I highly recommend him. He keeps his promises. I trust him wholeheartedly, and he's also very talented and has a special eye for it. I'm so happy my husband found him. We definitely have a jeweler for life now. Thank you SO MUCH Greg!!!
Setareh Nasseri
Setareh Nasseri
20:01 08 Aug 18
I had a wonderful experience getting a custom engagement ring made at Jacob Mercari. Excellent customer service, great product and great results. My fiancee was thrilled with her ring. It is perfect. Go with Jacob Mercari. Just trust me. You won't regret it!
The Chin
The Chin
21:30 20 Jul 18
Greg has been awesome to work with. I had started working with a larger custom engagement ring company as well in order to compare services but chose Greg because it was clear his priority throughout the process really was to make sure we made informed decisions we would be happy with for life - literally zero sales pressure. He made sure to explain everything I needed to know about choosing a diamond and really went out of his way to make sure we could look at all of the different options to consider. My fiance and I are super happy with the final product and with the process. I'd strongly recommend Greg to anyone.
Keith Drakeford
Keith Drakeford
15:03 01 Jul 18
Greg helped us create our custom wedding bands. At every step he was warm, knowledgeable, and very patient with us. Incredible service, and the rings are beautiful - so glad we chose Greg instead of one of the big jewellery chains!
Alex Curelea
Alex Curelea
14:14 14 May 18
Greg is a caring, genuine, and true expert when it comes to customer service and jewelry making. We are very happy with the services that he provided especially compared to some of the major retailers out there today. His service is customized to our individual needs and he takes to time to involve us in the design and making process. We would recommend Greg to our friends and family with no hesitation.
Tracy X.
Tracy X.
20:37 06 May 18
Dealt with Greg over the last few months and he was very accommodating and texted/emailed me when he found new diamonds meeting my requirements. His hours were flexible and he met with me on weekends because it fit better with my schedule. 5+ stars!
Mike nice
Mike nice
16:08 05 May 18
I approached Greg to design and create a custom engagement and the whole process was thoroughly transparent, professional, and enjoyable. During my initial visit and the selection of the stone, Greg recommended diamonds within my budget that had excellent light performance while still being at a great price. He presents these stones under a single fluorescent light source to showcase their performance under typical lighting, unlike jewelry stores that use multiple pot lights that would make any diamond sparkle. There was complete transparency in the cost breakdown of the stone and the band and I felt no pressure to commit to the deal.I requested a band design with very intricate and fine details. Greg responded quickly to any inquiries and requests. He and his team sent me 3D renders of the design, and we met to discuss changes and refinements to the band until we reached a design that was exactly what I wanted. The final product was perfect, and Greg surprised me with an upgrade of the band from white gold to platinum. My fiancee was thrilled as every aspect of the ring was exactly what she wanted.I am also very happy with the free aftercare services. Greg even met us outside of office hours to make sizing adjustments and to give the ring a polish. I could tell that he cares for his customers and takes pride in his craft. I unreservedly recommend his services.
Yulong Sun
Yulong Sun
15:21 14 Apr 18
The Mercari team did an amazing job designing an engagement ring for us! Greg was a joy to work with. We went with a sapphire, and Greg was able to provide us with a large selection of beautiful and ethically sourced stones to choose from. The final ring is stunning! The design process really made the ring unique. And the price was great. I definitely recommend!
Daniel Pyette
Daniel Pyette
19:00 29 Mar 18
Greg was great and very responsive during the whole process. He had tons of selection and was very helpful with lots of suggestions. The final product turned out perfect! Would definitely recommend.
Nick Chan
Nick Chan
15:52 17 Feb 18
Greg was a pleasure to work with! My engagement ring had diamonds 3 quarters around the band and I wanted to make it an eternity by adding more diamonds. He did this in one day!! Plus he cleaned & polished the ring so it looks bright and sparkly. I am extremely happy with the service, price and the result. Would definitely recommend Jacob Mercari to anyone who's looking for an excellent jeweler in Toronto.
Rachel Lee
Rachel Lee
15:05 15 Jan 18
Greg was very responsive to us when we had questions all the way through the process of having an engagement ring made. Even before we committed to purchasing anything, he was quick to respond to emails. Greg is very professional, genuine, and accommodating. He would meet with us on his days off, since we were coming from outside the city. We had very specific requests about the ring and Greg was able to meet all the requests within our budget, and even told us we would be saving money on purchasing lab-created diamonds instead of mined ones. Where we saved on the diamonds, he informed us he could cast the ring in platinum instead of gold. We had a design in mind for the engagement ring, Greg and his team were able to provide us with a render of the ring before committing to casting it, which was nice to see. Included in the price of the ring, was an annual cleaning service, as well as inspecting the ring for damage. It is a nice touch to great service. Very much appreciated. We would recommend Greg to anyone we know personally, and would approach him again in the future for other custom jewelry.
David Gregory
David Gregory
21:25 30 Dec 17
If I could give 6/5 stars, I would. My experience with Jacob Mercari was nothing short of perfect. I worked with Greg on my engagement ring, and from the very first meeting through finished product his customer experience was above and beyond. He made me very comfortable with the whole diamond buying experience, gave me much knowledge on the subject and was never pushy with options or even working with his company. We created a custom piece, stayed in budget and my fiance could not be happier with the finished product. I visited numerous other jewelers and can say without a doubt I made the right decision. I highly recommend Jacob Mercari for anyone looking for an engagement ring.
Brandon Banner
Brandon Banner
18:48 20 Dec 17
I must admit this was the most unexpected wonderful experience I've had in all my years of shopping for jewelry. I did not know what to expect going in but I think I prefer this than going into a store. It is a private and personable experience which does not make you feel like you are in a rushed situation.Greg was kind, knowledgeable and patient enough to listen to what I wanted, to give me options that lined up with what I needed (rather what she said she wanted, because that's how it really is when you're buying an engagement ring). I really appreciate the services offered and the work done. A truly beautifully designed ring that was ready by the date I said I would have needed it. Fantastic service and exceptional professionalism. I will continue to use his services as he is now my go to jeweler.
Adrian Bryan
Adrian Bryan
20:55 19 Dec 17
We recently purchased a beautiful CanadaMark Diamond from Greg. He found us just what we were looking for and made the diamond buying process very comfortable and easy! He really knows his stuff and we felt very confident in his selection.
22:08 25 Nov 17
I think I visited 7 different jewellers across Toronto (and online!), but found Jacob Mercari to offer the best selection, value, and service. Instead of pushiness and deception, I found graciousness, excellent knowledge of the market, and integrity. My fiancée loved the ring -- the diamond as well as the artistic setting. Couldn't recommend them higher.
Logan Gates
Logan Gates
18:59 10 Oct 17
I recently purchased a custom engagement ring. Having done my research I knew Jacob Mercari had great ratings, and my experience backs up why they have 5-star ratings time and time again! I vaguely knew what I was looking for prior to my first visit, but Greg worked with me to design the perfect engagement ring! My fiance is over the moon about how amazing her ring is! Initially I feared my tight timeline would be an issue, but Greg made sure the ring was ready very quickly. And the quality... wow! I guarantee you will not be disappointed buying a ring here!
Chris Rausch
Chris Rausch
23:07 03 Oct 17
I had a great experience with Jacob Mercari. Gregory was very knowledgable and helpful.
Samantha Claydon
Samantha Claydon
08:19 28 Aug 17
Such amazing work! Im so happy i find found you guus to help custom make my now fiances ring! She absolutely loves it! I couldnt have asked for better! You guys are the best! Thank you guys!
Bronson Houle
Bronson Houle
02:30 23 Jul 17
I found Jacob Mercari on internet. At first I was skeptical with Greg. After several discussions. he made me feel comfortable and took his time in explaining the 4c's and provided me options for my diamond earrings purchase - no pressure. It was a surprise birthday gift for my wife. He's very professional and answered all my inquiries in a timely manner. We were very happy and satisfied with Greg. I would recommend him.
Wilson Ngo
Wilson Ngo
14:53 17 Feb 17
Working with Greg at Jacob Mercari was a great experience. His knowledge and guidance through the process of design and implementation was invaluable. Thanks so much!!
krishna beharry
krishna beharry
21:17 16 Feb 17
Dealing with Gregory Jacobson at Jacob Mercari, was an absolute joy. After painstakingly searching for a professional outfit which you could trust, I couldn't be more pleased to have purchased a ring from the company. My fiancee and I were beyond happy with the outcome of the ring quality, price and delivery time. We will definitely be going back to deal with Gregory Jacobson at Jacob Mercari, and will strongly suggest anyone looking for jewelry to only deal with Gregory Jacobson at Jacob Mercari! Thanks again!
Devin Wosminity
Devin Wosminity
18:56 08 Nov 16
Greg did a fantastic job for us! I trusted him every step of the way, and he was very patient in answering all of my questions and working with me. He was a pleasure to work with--from finding the right stone to designing the whole piece. I would not hesitate to recommend Greg!
Jordan Waltman
Jordan Waltman
18:18 20 Sep 16
My overall experience with Jacob Mercari was educational, value-added, and fun! And my impressions of Greg as an individual are that he is patient, meticulous about providing quality, and above all trustworthy.Greg far exceeded my expectations with regards to 3 custom rings (1 engagement, 2 wedding bands); however, what truly stands out is not the final product (which is amazing) but rather the process Greg takes you on.He goes above and beyond to invest into you as a customer. What I mean by this is that Greg takes the time to educate you on the industry as a whole, his company, the process, and is more than willing to answer any questions you may have at any time. He does all of this without any commitments from you monetarily or otherwise, and even if you do not make a purchase, after meeting Greg you will be more informed and prepared to make smart purchasing decisions. My absolute favorite part of the entire process is working with Greg to design the rings. He is a great listener and is able to translate your thoughts effectively into a great design. It’s also really helpful when you can touch and feel loose stones and example settings, as you really begin to understand what it takes to put a ring together. As a next step, you work with Greg to review 3D renderings of your design and have an opportunity to make sure all the fine details that truly make your ring unique are taken care of (the graphics are pretty cool too).It’s at this point in the process you leave things in Greg’s very capable hands. He provides frequent updates on the progress of your rings, and he is sure to follow-up if there are questions about the details – I really appreciate that he doesn’t make any assumptions on your behalf and that he ensures you are comfortable throughout the entire process.In the end, what you are left with is something truly unique and something you really feel you’ve had a part in putting together (as opposed to just picking out something off of a retail store shelf).I have and will continue to endorse Greg to my friends and family!
Derrick Sarwan
Derrick Sarwan
02:27 10 Jun 16

Our Promise to You

We Work To Earn Your Trust
Trust is something that is earned. Our goal is to earn your trust by offering the highest quality jewellery, being fully transparent in our practices, and working with the belief that it is our responsibility to satisfy your interests and desires in a respectful and friendly environment.

We Stand Behind Our Products
We only sell top-quality GIA certified loose diamonds and we carefully curate our extensive inventory. This allows us to provide a larger selection of truly special diamonds.

No Pressure Sales
There are no salespeople at Jacob Mercari – only passionate jewellery design experts. As our guest, you’ll enjoy a friendly and honest customer experience with no hard ball or pressure selling.

Educated Advice
New to the diamond buying experience? First time with custom-crafted jewellery? You’ll never make a mistake with us. Questions are always welcome and we will answer or find the answer for you. We’ll teach you everything you need to know about how to choose the perfect diamond, so you’ll feel as confident with your choice as you are with her.

Proof of Authenticity
When you purchase a Canadian-origin diamond from our collection we’ll provide you with a certificate of authenticity outlining the history, grading, and details of your diamond that you can use for insurance purposes. You’ll receive our assurance in writing that your diamond comes only from legitimate, tracked sources.

Craftsmanship is at Our Core
We work with the finest artisans and use only the highest quality alloys and materials. We go the extra mile to make sure the engagement rings and jewellery we produce are made with an extreme eye to detail and precision. If a piece does not meet our exceptionally high quality standards, we will start over and do it right at our cost.

The Finest Quality Diamonds and Gemstones
We employ only the highest-skilled jewellers and goldsmiths who work with the finest quality diamonds and gemstones.That means no brown tinges, no strong fluorescence, no surface inclusions, no cracks, and no centre black inclusions.

From top quality metal alloys to the most exquisitely cut and ethically sourced diamonds, you’ll be absolutely assured of the finest quality stone.

Completely Unique Creations
Your custom ring will be unlike any other on Earth, and she’s guaranteed to receive a ring that will be as unique and precious as your love.

Thorough Quality Inspection Process
Our attention to detail is second to none, and every piece is rigorously and thoroughly hand inspected before delivery. You’ll enjoy the peace of mind that comes with knowing each diamond has been strictly graded and expertly cut. We go well beyond the 4 C’s – carat, colour, clarity, and cut – delving into the crystal’s inner qualities and very carefully critiquing it based on its purity and various colourations – to ensure that we’ll never deliver a product that is anything less than perfect.

You Can Change Your Mind
We stand behind everything we sell. But most importantly, we stand behind you. If you select a natural diamond from our inventory and change your mind within six months, we will credit the full amount of the diamond cost to you. It’s our way of letting you know we’re in this together, and we will never allow our customers to experience buyer’s remorse.

Your Custom Ring Will Exceed Your Expectations
We promise you an experience free of surprises. Our artisans will craft the ultimate ring creation after detailed consultations with you. But if your custom-designed ring isn’t exactly what you had imagined at the time of final inspection & pick-up, we’ll remake it at no cost to you. It’s on us to make sure we exceed your expectations.

Complete Aftercare
Unlike most jewellers, our partnership with you doesn’t end once we’ve delivered the perfect jewellery – it’s just the beginning. We provide a full range of services post-delivery to ensure you maximize your investment and fulfill her dreams.

Our free aftercare services include a ring sizing, as well as inspection and diamond or gemstone tightening to ensure a magical fit. We’ll clean your ring for the life of the ring, and we will be delighted to polish it for you before the wedding.

A Stress-Free Environment
Our mission is to consult with, advise, and educate you in a relaxed, private, and friendly environment. There are no commissioned salespeople with Jacob Mercari, just passionate jewellery design experts who are committed to helping you fulfill her dreams. You’ll never feel pressured in any way.

Your Jewellery is Ethically Produced
We take our ethical obligations seriously. All of our creations are made locally in Toronto, Canada, using only materials ethically produced and sourced from conflict-free conditions and using environmentally sustainable processes. We are an authorized distributor of CanadaMark diamonds, representing the pinnacle of responsible diamond trading.

We believe in offering our employees fair wages and employment conditions, as well as giving back to the community by donating a portion of our sales to charity.

Free Delivery
All of our products can be delivered to you free of charge, anywhere in North America.

Price Match Guarantee
We are committed to your satisfaction, and we will price match any comparable competing offer. Moreover, unlike other jewellers, there’s no need to haggle with us; all of our products feature our most attractive price upfront, with full transparency, so you’ll know you’re receiving the best quote possible.

We Keep Our Costs Low
Our jewellery is made by us. A complete control over manufacturing lets us keep our costs down and our quality exceptionally high.

We also work directly with licensed diamond manufacturers to provide the most brilliant diamonds at the sharpest possible prices. With 30 years of experience in the business, we know what to look for and how to source the best products at a fair and reasonable cost.

Free Support
We provide free aftercare support for all our valued customers. From free ring sizings, tightening, and maintenance to free cleaners – we’re at your service to ensure your jewellery remains in pristine condition.

Ethical Partnerships
All of our industry partners are carefully screened and conform to the highest ethical standards, and we will only work with members of the Responsible Jewellery Council. Our partners are regularly audited for supply chain custody, ethics, and safe working conditions.

Responsible Sources
At such a special time in your life, you want to ensure that your diamonds are sourced from only responsible and ethical suppliers. We require our manufacturing partners be licensed to receive rough diamonds directly from responsible mining companies such as De Beers and Dominion Diamond Corporation to give you peace of mind from knowing that your diamond has been obtained fairly and responsibly.

We vet and confirm the quality of the sources of all of our diamonds and gemstones, and only obtain loose diamonds directly from the manufacturers – never through intermediaries.

CanadaMark Authorized Distributor
We offer loose diamonds from CanadaMark, a hallmark of the Canadian-owned Dominion Diamond Corporation committed to responsible mining and sustainable practices.

GIA Certified Diamonds
All of our diamonds are independently tested and certified by the Gemological Institute of America (GIA) to ensure their quality. Any diamond we sell will include a GIA report and grading certificate.

Recycled Materials
We are proud to use recycled gold sourced from previously mined jewellery and discarded electronics as part of a sustainable and responsible jewellery practice.

Our Goal is Sustainability
We like to rest easy at night knowing we have made a beautiful piece of jewellery manufactured from environmentally sustainable materials.

We insist on only working with industry partners who are hard-working, trustworthy, and dependable, and who subscribe to the same values of promoting environmental sustainability and responsible practices. To that end, we are proud to work with recycled gold and platinum, as well as offer environmentally-responsible CanadaMark loose diamonds. We exclusively choose partners who are members of the Responsible Jewellery Council.

Recycled Gold and Platinum
We use recycled gold and platinum in our jewellery, preventing them from having a harmful impact on the environment.

CanadaMark Diamonds
We are proud to be an authorized distributor of CanadaMark diamonds, who are the standard bearers for providing responsibly and environmentally sustainably sourced diamonds from their mines in Canada’s Northwest Territories.

Conflict-Free and Responsibly Sourced Gemstones
Our promise to you is that your diamond or gemstone is obtained from verifiably responsible partners and is sourced from conflict-free mines, through fair trade and employment practices.

We Practice What We Preach
We make all of our products ourselves at our Toronto, Canada, facilities. Since we control the manufacture of your jewellery, you can rest assured that it was created responsibly and in a positive environment. We believe in providing our associates with with fair wages and positive working conditions.

We also believe in giving back to the community, and as such we donate a portion of our sales to various charitable organizations.

Schedule appointment or send us a message

By Appointment Only – Please Call or Email to Schedule


1004-27 Queen St E, Toronto, ON M5C 2M6

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Hours of Operation:

Monday - Thursday
9:00am - 5:30pm EST
9:00am - 4:00pm EST

Evening and Weekend Consultations are Available by Appointment

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