METAL: platinum, 18K Gold. GEMSTONES: yellow diamond-0.25ct, white side diamonds. MEASUREMENTS: ring size 4.75. Top measures 7.8mm at widest point. MARKED: Tiffany &Co Pt950 Au750 29117454 D .25Ct. WEIGHT: 3.9 grams. Retail $5100.Gemstones have not been graded for color and clarity, and tested for clarity and color enhancement, unless stated otherwise.