METAL: 18k Gold. MEASUREMENTS: Bracelet will fit approx. 7" wrist, "O" measures 49mm x 48mm. GEMSTONES: Black jade. MARKED: Tiffany & Co, Elsa Peretti, 750, Hong Kong. WEIGHT: 81.1 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.