Green Opal Green Iris Pendant Necklace in solid sterling silver. Size: 9.1 x 15.2 mm (0.36 x 0.6 in). Material: Sterling Silver. Total metal weight: 3.72 gr. Round cut green opal (8 x 8 mm) = 1.5 ct total. Colour: Green. Stone cut: Round Cut. Occasion: Mother's Day. Anniversary: 14th Anniversary. Birthstone: October.