Cushion Cut Alexandrite & CZ Anti Ring in solid sterling silver. Material: Sterling Silver. Total metal weight: 3.9 gr. Cushion cut alexandrite (9 x 7 mm, grade AAA) = 2.75 ct total. Round cut cubic zirconia (1 x 1 mm) = 0.68 ct total. Colour: Colour Changing. Stone cut: Cushion Cut. Occasion: Engagement, Wedding, Mother's Day. Anniversary: 55th Anniversary. Birthstone: June.