Experience a smarter way to sell your jewelry. Our expert buyers personally evaluate every piece submitted to ensure you receive exceptional value and service.
Tell us about your item, include a few photos, and one of our experts will reach out shortly.
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.
Diamond Banc is the nation’s leading diamond buyer with diamond buying offices throughout the country. It’s convenient and secure for people in St. Louis to sell their diamonds to one of the nation’s highest-paying diamond buyers who are located in Missouri. For those seeking to sell their diamonds in St Louis, we are truly your best option. Our diamond buying and funding process is simple, fast, and secure.
cDiamond Banc considers numerous factors when calculating our diamond purchase offers, such as carat weight, diamond shape, color, and clarity grades. All of these factors play a role in determining your diamond’s current liquid market value. Our data-driven evaluation process empowers you to get the most money for your diamond. We deploy market research to determine and outline your diamonds’ worth on the secondary market.
Diamond Banc supplies a nationwide network of jewelry retailers, diamond dealers, and private collectors with the inventory. This major advantage allows us to pay higher prices for diamonds of all types as we have established buyers that prefer different qualities, shapes, and sizes. These proprietary selling channels allow us to provide you with a maximum return when you sell a diamond. Our mission is to explain to you the value of your diamond and offer you the highest payout.
Using DiamondBanc was a sensible solution for us while planning for our wedding! Mia made it so easy and was great with communicating how she could help us!! Will definitely use again!! 😊
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.
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
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.
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.
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.
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!!
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.
I don’t have a lot of experience selling higher valued personal items and when I have it’s always been private sales or just a quick pawn shop stop. However I had a nice 14k gold necklace I’ve had for a couple decades that had a broken clasp and wasn’t my style anymore so I made the decision to sell it. Did some research and found this company and I kid you not it was so simple and kept the icy corporate sales feel out it. Mia is super personable, knowledgeable, and efficient. I had an email quote and same day appointment set up within an hour of my inquiry, went to office, had my appointment which took about 15-20 min since I did the quote ahead of time and I walked out with my check. Will be going back for any future sales I plan to make involving jewelry or precious metals. They absolutely deserve the 5 star ratings they receive.
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
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.
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.
Transaction was handled professionally and courteously. Correspondence was prompt and meeting efficiently conducted. Highly recommend dealing with this business
Diamond Banc’s national headquarters is located close by in Columbia, MO. After you have received our purchase offer, you can complete the transaction by overnight shipping your item to us fully insured via FedEx at no cost to you, or you’re welcome to make the short drive to Columbia to complete the transaction in person. We’re happy to come to you in St. Louis to complete a major diamond and jewelry buying transaction.
We’re eager to buy diamond rings made by the world’s top jewelers such as Graff, Harry Winston, Tiffany & Co., and Cartier from the St. Louis market. Diamond Banc will treat you with kindness, respect, and transparency and will be happy to provide you with a zero cost, zero pressure evaluation. With over 1,000+ company-wide Google reviews, Diamond Banc is your best option when looking for a St. Louis diamond buyer.
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.
We Are Actively Seeking The Following:
Diamonds of different shapes and sizes (generally .50ct & larger).
GIA certified and non-certified.
Currently paying premiums for diamonds 2cts and larger.
We pay high premiums for diamonds 5-10ct+.
Designer diamonds & engagement rings from coveted brands.
Connect With Us Today
Fill out the quick form above and we will provide you an approximate buy price and then determine the best plan to complete the transaction.
Feel free to connect with one of our Senior Diamond Buyers, Kyle or Jordan, both of who actively serve the St. Louis market from our headquarters in Columbia, MO.
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.
Mills Menser
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