METAL: 18k Gold/ Platinum. MEASUREMENTS: Ring size - 4.5, ring top - 16mm x 21mm, sits approx. 9mm from the top of the finger. GEMSTONES: Diamonds approx. 3.00ctw. MARKED: 18k. WEIGHT: 16.9 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.