St. Louis’s Premier Jewelry Buyer
- Sell Your Fine Jewelry
Designer pieces by Tiffany & Co., Cartier, David Yurman, Graff, Harry Winston, etc., or high-value fine jewelry of any type.
- Sell Your Engagement Ring
Diamond engagement rings, wedding bands, complete wedding sets, etc.
- Sell Your Loose Diamonds
Individual diamonds of 0.50ct or larger. Certified or un-certified. Receive a free evaluation for your diamonds.
- Sell Your Luxury Watches
Rolex, Cartier, Breitling, Omega, Tag Heuer, etc.
- Sell Your Gold and Silver
Coins or bullion.
- Sell Your Jewelry on Consignment
Diamonds, diamond jewelry, signed designer pieces, and luxury watches.
What St. Louis Clients Have to Say…
Absolutely stellar customerservice and very knowledgeable staff. I’d go back again.
Mia was amazing to work with and the company offers great prices!
Worked with Mia to sell an engagement ring. It only took a few minutes for the appointment and they gave me a great price. Much better than trying to sell on marketplace etc.
Quick and professional, even scheduled me out of schedule, for convenience, hats off to Mia Cossey and team .
Great experience, even got more than I was quoted for my chain
From from the moment I got there she was very warm inviting very knowledgeable. Made the whole process. Go smooth and I believe I got top dollar for my golden silver and diamonds. Definitely have a claim for life now and the view in the office is amazing. go check it out. ..
As soon as we met our specialist, she was warm, inviting very down to earth made the whole process go smooth and made me feel like I was getting the best deal possible very knowledgeable and gems and golden silver as well as amazing view in office great place to go
An amazing experience with Mia . She is very energetic,honest and fair ! I enjoyed the visit!
They were very easy to work with. Sent them the information about what I want to sell, they quoted me a price. Easily made an appointment and was out in just a few minutes. Will definitely do work with them again.
Appointment was quick and easy. I received a check for a fair amount on the spot. Highly recommend!
Mia was great, very friendly and efficient, and I got a good price for my jewelry.
Best in St. Louis, very helpful
I had an over the top experience at Diamond Banc today! Mia exceeded my expectations with the amount paid to me for my gold. I will definitely recommend Diamond Banc to my friends and family!
Very friendly and professional. My gold was valued properly, fast, and efficient. This place will definitely be something I recommend to others. Thank you
I went to Diamond Banc to sell my wedding ring, and Mia immediately offered me the best market price. I didn’t even need to visit any other jewelry buyers. She was incredibly sweet, friendly, and made the whole process easy and comfortable.
Excellent to work with! I will always work with them
Work with Mia on a ring I never wear anymore. Gave me a super deal. I would definitely check out Diamond Banc if you have a old ring that’s valuable and want the best deal in town.
Smooth and easy transaction.
I think they were fair, And everything was done right there in front of me. And Great service…
Mia was amazing! We went in to sell a few pieces of jewelry for what we expected to be a small amount of money. We walked out with a large check in hand! The process was seamless and simple. Don’t sell your gold to a pawnshop! Sell it to Diamond Banc!!
Diamond Banc responded quickly, and the process was quick and easy. I had a great experience, and I will be returning. I recommend Diamond Banc!
I had a wonderful experience selling some jewelry pieces with Diamond Banc. Mia was informative and fast. I was in and out with a check in under 30 minutes.
The process was very quick and seamlessly easily and the staff are very friendly! Highly recommend.
Lyndsey was very helpful and knowledgeable about the ring I was selling. She explained in detail how they came up with their offer for the ring. The offer was fair and higher than any of the other places I went to.
Schedule a meeting with Mia. She was very informative. Explained the market very well and gave me a great price for my jewelry. I was very pleased with the experience and service.
Mia made the entire process from booking the appointment to walking out the door easy as pie!!!! Took her card to tell all my friends & if I need to sell some more pieces! 10 outta 10 recommend
The best in business!!!!!!
Mia was such a pleasure to work with!!!! Professional, passionate, and dedicated to her craft. Diamond Banc is lucky to have her!
Mia was GREAT to work with! Great with customer service and very personable!! Bought my 14K gold Diamond ring for a good price!!!
Mia was so nice! She was very polite and very kind
Very good experience. Fast and professional.
Meeting with Mia Cossey was an absolute pleasure. Very knowledgeable and honest with additional advice on related matters. I will definitely return.
I had such a pleasant experience working with Mya! She was quick , efficient and very fair with her offer! Diamond Banc has earned a life long customer.
I recently sold a watch. Lyndsey was very polite, knowledgeable and quick. I feel I received a fair price for my item. I recommend Diamond Banc and will return in the future.
My experience was very pleasant and relaxing. I left feeling completely comfortable with my decision. Thank you for your help.
Professional, trustworthy service. I would use them again without hesitation.
Easy to work with Diamond Banc had many pieces went as professional as it could. With rarities, Scotsman and others found not as nice to deal with.
Quick and easy process with great value transaction
I had an absolutely fabulous experience here. Mia is amazing and super knowledgeable and helpful. I felt like I got an amazing deal for what I brought in and she was quick, polite, and super friendly. Definitely recommend 10/10. I will be going here for all my future jewelry sales.
I recently had the privilege of selling a diamond that I had inherited from my late brother. I was a bit skeptical, being this was my first diamond sell. Mia was extremely welcoming and made the process very easy and comfortable. I was able to share the story of my late brother and how I came in possession of such a great gift. She was warm and welcoming and offered her condolences. She made the atmosphere feel less business like and more personalized. I absolutely will continue to patronize Diamond Banc and will highly recommend for their excellent service.
Very professional service and super friendly people with big smiles !
I had good experience with you and enjoyed my self you have a nice office it was fun thank you
They were awesome helping me with some jewelry I had to see if they were worth anything and helped me with a watch if it was fake or not. They were AWESOME!! In every thing.
Mia (Lindsey) was very professional and informative during the entire process.
Excellent customer service! Everything went so quick and smooth. They were very kind and patient with us even when we brought our tired and fussy toddler to our. A appointment.
Mia was such a pleasure to work with , very nice & the process is quick & easy . She answers all questions with no hesitation ! I will be back
It was great working with Mia! She was quick and efficient and provided a fair price. She was very personable as well. Would do business with her again.
Easy to schedule consultation, friendly staff and overall good experience.
Highly recommend!
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Other Items We Buy
Diamond Banc of St. Louis is a premier destination for selling fine jewelry, including diamond engagement rings, loose diamonds, estate and vintage jewelry, and designer pieces from luxury brands such as Cartier, Tiffany & Co., and Van Cleef & Arpels.
We also specialize in purchasing high-end watches from brands, if you’re look to sell your Rolex, Patek Philippe, and Audemars Piguet. In addition, we offer cash for gold and silver in all forms, including jewelry, coins, and bullion.
Clients throughout St. Louis, Missouri, and surrounding areas trust Diamond Banc for our discreet process, competitive offers, and market-driven evaluations.
Visit One Of Our Diamond Banc Locations:
Diamond Banc Affiliate Locations:
Meet Our St. Louis, MO Market Director
Mia Cossey
With over 13 years of distinguished experience in the jewelry industry, Mia Cossey leads Diamond Banc of St. Louis with a commitment to delivering premier service and unparalleled expertise. As a Certified Diamontologist and GSI Diamond Essentials professional, Mia combines technical knowledge with a deep understanding of the luxury jewelry market. Her previous role as Store Manager at Signet Jewelers in St. Louis underscores her dedication to exceptional client care and operational excellence, managing everything from quality control to client repairs and high-value transactions. At Diamond Banc, Mia’s client-centered approach ensures each interaction is transparent, informed, and tailored to meet clients’ unique financial needs.
How it Works
- Request a quote
- Visit an office or request a label
- Receive your offer and funding within 24 hours
Get Started
Mills Menser
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