METAL: 18k Gold. MEASUREMENTS: Necklace is 17" long, Pendant - 65mm long, largest chrysoprase stone is 39mm in diameter. GEMSTONES: Diamonds, onyx, chrysoprase. MARKED: 720 71, 18Kt. WEIGHT: 38.9 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.