Men's London Blue Topaz Necklace in solid sterling silver. Size: 19.1 x 22.4 mm (0.75 x 0.88 in). Material: Sterling Silver. Total metal weight: 19.52 gr. Half moon cut London blue topaz (12 x 8 mm) = 4 ct total. Colour: Blue. Stone cut: Half Moon Cut. Anniversary: 4th Anniversary. Birthstone: November.