Cushion Cut Blue Opal Pendant Necklace in solid 9ct white gold. Size: 6.4 x 12.7 mm (0.25 x 0.5 in). Material: White Gold. Total metal weight: 0.58 gr. Cushion cut blue opal (6 x 6 mm) = 0.5 ct total. Colour: Blue. Stone cut: Cushion Cut. Occasion: Mother's Day. Anniversary: 14th Anniversary. Birthstone: October.