18k ANTIQUE 1.85 CT DIAMOND RING CA 1915-1925: 18K white gold ring with 2 old European round cut diamonds. Diamond one weight approx. 1.00 Ct., SI1 in clarity and M color. Diamond two weighs approx. .85 Ct., is rated VSI in clarity and M color. One triangle cut synthetic sapphire, one is missing. Diamonds are prong set. Size 4.5. Weight 4.1 grams.