St. Louis Premier
Jewelry Buyer & Lender

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.

(314) 876-6659 stlouis@diamondbanc.com Book Appointment Get a Quote

At Diamond Banc of St. Louis, we take pride in offering unparalleled financial solutions and luxury services tailored to our clients’ needs. Whether you’re looking to access immediate capital, sell your valuable jewelry, or explore a range of tailored financial options, our team of seasoned experts is here to serve you. Discover why Diamond Banc is trusted across the nation and see how we can best assist you right here in St. Louis.

Our Services

1. Jewelry Equity Loans
Access the liquidity your fine jewelry, diamonds, and luxury watches hold without parting with them. Our Jewelry Equity Loans provide fast, discreet, and flexible funding. Borrow against your high-value assets, including designer jewelry and rare gemstones, and retain ownership once the loan is repaid.
Ready to leverage your jewelry for a financial boost? Call us today or text us for a personalized consultation.

2. Immediate Purchase of Jewelry
Receive the highest possible market value when selling your jewelry at Diamond Banc of St. Louis. Our transparent process ensures that you feel confident every step of the way. We purchase diamonds, designer pieces, gold jewelry, and luxury watches. With market-leading expertise and state-of-the-art evaluation, we promise prompt, fair transactions.
Looking to sell your jewelry? Book an appointment or call us now for a no-obligation quote.

3. Luxury Watch Loans & Purchases
Your luxury watch can be a source of immediate funds. We offer loans against brands such as Rolex, Patek Philippe, Audemars Piguet, and more. Alternatively, if you’re looking to sell, we guarantee top market value and a seamless transaction.
Find out the value of your luxury timepiece! Text us or book your appointment to get started.

4. Designer Jewelry Loans
Gain access to cash without parting with your cherished designer pieces. We accept luxury brands such as Cartier, Tiffany & Co., Van Cleef & Arpels, and many others. Our experts meticulously assess each item to ensure the highest loan or purchase offer possible.
Turn your designer jewelry into capital! Contact us for a complimentary assessment.

5. Diamond Loans & Purchases
Our expertise extends to evaluating and purchasing diamonds of all shapes and sizes. Whether your diamonds are loose, set in a piece of jewelry, or part of an estate collection, we provide transparent and competitive offers. Our diamond specialists use advanced appraisal techniques, ensuring the most accurate valuation.
Ready to unlock the value of your diamonds? Call or text us today or schedule an appointment online.

6. Estate Jewelry Purchases
Do you have antique or estate jewelry that you no longer need? At Diamond Banc, we specialize in understanding and appraising estate pieces with historical and sentimental value. We offer direct purchases and options for consignment sales, allowing you to choose what best suits your situation.
Discover the value of your estate pieces. Reach out to our experts for a comprehensive consultation.

Why Choose Diamond Banc of St. Louis?

• Unmatched Transparency: We ensure a transparent process from start to finish. Our detailed appraisals and clear communication set us apart.
• Client-Centric Service: We prioritize your comfort, privacy, and trust. Every client receives personalized attention tailored to their needs.
• Competitive Offers: With access to nationwide market insights and a vast network, we can provide some of the highest purchase and loan offers in the industry.

How to Connect with Us

Experience the Diamond Banc difference by reaching out directly to Mia Cossey Director of our St. Louis team.

• Call or Text: 314-876-6659
• Book an Appointment
• Start Online

Whether you need instant financial solutions, want to sell your luxury assets, or are simply seeking expert advice, Diamond Banc of St. Louis is your trusted partner. Visit us and experience first-hand why we are the leading choice for jewelry equity lending and purchasing.

Get started today – because your jewelry is worth more at Diamond Banc!