Black Opal & CZ Cabochon Ring in solid sterling silver. Material: Sterling Silver. Total metal weight: 4.3 gr. Round cut black opal (10 x 10 mm) = 1.5 ct total. Round cut cubic zirconia (1 x 1 mm) = 0.72 ct total. Colour: Black. Stone cut: Round Cut. Occasion: Engagement, Wedding, Mother's Day. Anniversary: 14th Anniversary. Birthstone: October.