METAL: 18k yellow gold. GEMSTONES: mother of pearl ,sapphire eye,diamonds - approx. 1.25ctw. MEASUREMENTS: Brooch measures 53mm x 50mm. MARKED: Boucheron, 750, Made in France,BMC, gold assay marks. WEIGHT: 25.8 grams.Gemstones have not been graded for color and clarity, and tested for clarity and color enhancement, unless stated otherwise.