Sell diamonds and diamond jewelry in Miami: CJ William at 9573 Harding Avenue Surfside is South Florida’s direct diamond buyer. GIA-graded loose diamonds, engagement rings, tennis bracelets, diamond stud earrings, and estate diamond jewelry. Same-day cash, wire, or USDC settlement on GIA-certified diamonds. In-house gemologist authentication and 4Cs verification. Sun-Fri 11 AM to 5:30 PM.
Miami’s Direct Diamond Buyer: Who Buys Diamonds in Bal Harbour and Surfside
Looking for who buys diamonds in Miami? CJ William is South Florida’s direct diamond buyer. Located four minutes north of Bal Harbour Shops, we serve Bal Harbour, Aventura, Sunny Isles, Coral Gables, and Miami collectors, estates, divorce settlements, and private sellers. Our GIA-trained gemologists verify the 4Cs (cut, color, clarity, carat) in-house, and we resell directly to our collector base rather than routing through wholesale channels — this lets us pay 20-40% above typical Miami diamond wholesaler offers.
Diamonds and diamond jewelry we buy in Miami
- GIA-graded loose diamonds (0.50 carat and up)
- Engagement rings (solitaire, halo, three-stone, vintage)
- Tennis bracelets (all carat totals)
- Diamond stud earrings (matched pairs)
- Diamond pendants and necklaces
- Signed jewelry (Cartier, Van Cleef & Arpels, Tiffany, Bulgari, Harry Winston, Graff, David Webb)
- Estate diamond jewelry (Art Deco, Retro, Mid-Century, Modernist)
- Colored diamonds (fancy yellow, pink, blue, green)
- Vintage cuts (Old European, Old Mine, Rose Cut)
2026 diamond market values
Loose GIA-graded diamonds
1 carat round brilliant D color VVS1: $8,500-$12,500. 1 carat E VVS2: $7,500-$11,000. 1 carat F VS1: $6,500-$9,500. 2 carat D VVS1: $28,000-$42,000. 3 carat D VVS1: $65,000-$95,000. 5 carat D VVS1: $180,000-$285,000. Lab-grown diamond values trade at 15-30% of natural for equivalent 4Cs. Fancy shapes (emerald, pear, oval, cushion, radiant) trade 5-20% below round brilliant of equivalent grade.
Engagement rings
1 carat solitaire in platinum setting $8,500-$14,500. 2 carat solitaire platinum $28,000-$45,000. Vintage Tiffany Setting original (pre-2000) $10,500-$18,500. Cartier 1895 Solitaire (2 carat) $32,000-$52,000. Halo settings trade at solitaire value plus 15-25% for setting.
Tennis bracelets
5 carat total weight tennis bracelet: $6,500-$11,000. 10 carat total weight: $15,000-$26,000. 15 carat total weight: $28,000-$48,000. 20 carat total weight: $45,000-$78,000. GIA-graded stones command 20-30% premium over uncertified equivalents.
Signed diamond jewelry
Cartier, Van Cleef & Arpels, Tiffany, Bulgari, Harry Winston, and Graff signed diamond jewelry commands 40-100% premium over unsigned equivalent. Vintage signed jewelry with original packaging and documentation commands 20-40% additional premium. Example: Van Cleef & Arpels Alhambra 5-motif diamond necklace $28,000-$45,000. Cartier Love bracelet with diamonds $22,000-$32,000.
4Cs verification and GIA certification
Our GIA-trained gemologists verify the 4Cs in-person: cut grade (proportion, symmetry, polish), color grade (D through Z scale), clarity grade (Flawless through Included), and carat weight (verified on calibrated scale). GIA certification adds 15-30% to market value versus uncertified stones. If your diamond is uncertified, we can arrange GIA submission for $150-$250 depending on carat weight (4-6 week turnaround). Existing GIA reports verified against stone via laser inscription check when applicable.
Lab-grown diamond values in Miami 2026
Lab-grown diamonds trade at approximately 15-30% of natural diamond equivalents in 2026. 1 carat lab-grown F VS1 $1,200-$2,400. 3 carat lab-grown F VS1 $6,500-$12,000. Lab-grown market pricing continues to compress as production efficiency improves — expect further depreciation in secondary market. CJ William buys lab-grown diamonds primarily as jewelry setting resale value rather than stone speculation.
How to sell diamonds in Miami
- Send photos of the diamond or jewelry via WhatsApp to (347) 510-0668. Include GIA report if you have one, close-up of the stone, and any documentation.
- Receive preliminary offer range within 24 hours.
- Visit CJ William at 9573 Harding Avenue, Surfside for in-person 4Cs verification.
- Same-day payment via wire, cash, or USDC once verification is complete.
Frequently Asked Questions
How much is a 1 carat diamond worth in 2026?
1 carat round brilliant D color VVS1 clarity trades $8,500-$12,500 in 2026. 1 carat F VS1 trades $6,500-$9,500. Fancy shapes trade 5-20% below round brilliant.
Do you buy diamonds without GIA certification?
Yes. Our GIA-trained gemologists verify the 4Cs in-house. Uncertified stones trade 15-30% below GIA equivalents. If desired, we can arrange GIA submission for $150-$250 with 4-6 week turnaround.
Do you buy signed Cartier or Van Cleef diamond jewelry?
Yes. We actively buy signed jewelry from Cartier, Van Cleef & Arpels, Tiffany, Bulgari, Harry Winston, and Graff. Signed jewelry commands 40-100% premium over unsigned equivalents.
Sell your diamonds in Miami today
Call (347) 510-0668 or visit CJ William at 9573 Harding Avenue, Surfside FL 33154. Sun-Fri 11 AM to 5:30 PM. GIA-trained gemologists on-site. Direct-to-collector diamond pricing. Same-day cash, wire, or USDC. See also: We Buy Estate Jewelry Miami.