Blue Opal & CZ Blue Designer Ring in solid sterling silver. Material: Sterling Silver. Total metal weight: 4.4 gr. Oval cut blue opal (14 x 10 mm) = 2.25 ct total. Round cut cubic zirconia (1 x 1 mm) = 0.52 ct total. Colour: Blue. Stone cut: Oval Cut. Occasion: Engagement, Wedding, Mother's Day. Anniversary: 14th Anniversary. Birthstone: October.