Sapphire & CZ Cocktail Octagon Ring in solid sterling silver. Material: Sterling Silver. Total metal weight: 4.37 gr. Rectangular cut sapphire (12 x 7 mm) = 4.5 ct total. Colour: Blue. Stone cut: Rectangular Cut. Occasion: Engagement, Wedding, Mother's Day. Anniversary: 5th Anniversary, 45th Anniversary. Birthstone: September.