METAL: Platinum. MEASUREMENTS: Necklace is 19 1/4" long, Pendant - 17mm x 8mm. Clasp is not secure, needs adjustment. GEMSTONES: Diamonds - approx. 0.45ctw. MARKED: Tiffany & Co, 2002, pt950. WEIGHT: 5.6 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.