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Jewelry Buyer in St. Louis
Let our highly qualified experts assist when it's time to sell your jewelry.
Mia Cossey
St. Louis, MO Market Director
Featured in
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.
Visit One Of Our Diamond Banc Locations:
- Tampa, Florida
- Boca Raton, Florida
- Miami, Florida
- Orlando, Florida
- Nashville, Tennessee
- Kansas City, Missouri
- Columbia, Missouri
Diamond Banc Affiliate Locations:
- Perry’s Jewelers | Roswell, Georgia
- Capetown Diamond Corporation | Charlotte, North Carolina
- Mann’s Jewelers | Rochester, New York
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.
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Schedule a private evaluation at your local Diamond Banc or use our online submission form.
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In-Person Evaluation
Complete In Person
Meet privately with a Diamond Banc director who’ll evaluate your items right in front of you & make you an offer.
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If you accept our offer, we will issue payment immediately via check or wire transfer.