METAL: Platinum. MEASUREMENTS: Ring size - 4 1/4, ring top - 5mm in diameter. GEMSTONES: Diamond approx. 0.30ct, 4 small side diamonds.. MARKED: Tiffany & Co, irid. plat. WEIGHT: 2.7 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.