METAL: 18k Gold. .MEASUREMENTS: Brooch is 48mm x 50mm. GEMSTONES: Carved crystal, backed with mother of pearl, Diamonds, pearls, emeralds, sapphires. MARKED: Seaman Schepps, Shell mark, 750, 10251. WEIGHT: 37 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.