London Blue Topaz Minimalist Pendant Necklace in solid sterling silver. Size: 12.7 x 22.4 mm (0.5 x 0.88 in). Material: Sterling Silver. Total metal weight: 5.27 gr. Round cut London blue topaz (6 x 6 mm) = 1 ct total. Colour: Blue. Stone cut: Round Cut. Occasion: Wedding, Mother's Day, Graduation. Anniversary: 4th Anniversary. Birthstone: November.