METAL: 18k Gold. MEASUREMENTS: Ring sizes - 5 3/4 (turquoise) and 8 1/2 (coral). GEMSTONES: Carved coral - 14mm in diameter, turquoise - 13.3mm x 9.5mm. MARKED: 750,, Gold marks. WEIGHT: 8 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.