METAL: 18k Gold. MEASUREMENTS: Necklace is 12" long and 38mm wide (will fit a small size neck) . GEMSTONES: Diamonds - approx. 26ctw, Pearls - 6.7-7mm. MARKED: Hammerman , 750, HB. WEIGHT: 187.2 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.