METAL: 18k Gold. MEASUREMENTS: Ring size - 6 1/2, ring top - 16mm x 15mm. GEMSTONES: Red stone - 7.5mm x 6mm, diamonds approx. 0.80ctw. MARKED: Italy, 18k, 713833. WEIGHT: 5.6 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.