Tanzanite & CZ Two-Tone Octagon Pendant Necklace in solid sterling silver. Size: 15.7 x 25.4 mm (0.62 x 1 in). Material: Sterling Silver. Total metal weight: 7.52 gr. Rectangular cut tanzanite (10 x 8 mm) = 4 ct total. Round brilliant cut cubic zirconia (1 x 1 mm) = 0.75 ct total. Colour: Blue. Stone cut: Rectangular Cut. Occasion: Wedding, Mother's Day, Graduation. Anniversary: 24th Anniversary. Birthstone: December.