Ring – Black pearl and Diamonds 18 carat gold (kt) white gold: 20.00 grams (gr). 71 diamonds brilliant cut: 1.14 total weight carat (ct) (H colour VS clarity). Tahiti pearl: 11 carat (ct) - Size 12.50 mm. Size: 5.50 inches (Usa) | 11 mm (Italy). Codex: Mess.