METAL: 18k Gold. MEASUREMENTS: Ring size - 5 1/2, ring top is 12mm x 10m, center will fit approx. 7.9mm x 5.6mm stone. GEMSTONES: Diamonds - approx. 0.80ctw. MARKED: 6.5, 750, 6339. WEIGHT: 5.2 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.