18K SAPPHIRE & DIAMOND RING: 18K yellow gold ring contains thirty eight round single cut diamonds. Weight: .38 Ct. Approx Rated VS-SI in clarity and Light Brown in color. At the center is a round shaped cabochon cut sapphire. Weight: .25 Ct. Approx. The diamonds are prong set. The sapphire is bezel set. Weight: 4.0 grams. Size: 7.5.