Men's Cushion Cut London Blue Topaz Necklace in solid sterling silver. Size: 12.7 x 22.4 mm (0.5 x 0.88 in). Material: Sterling Silver. Total metal weight: 18.52 gr. Cushion cut London blue topaz (9 x 9 mm) = 3.5 ct total. Colour: Blue. Stone cut: Cushion Cut. Anniversary: 4th Anniversary. Birthstone: November.