London Blue Topaz Ring in solid 9ct gold. Size: 12.7 x 12.7 mm (0.5 x 0.5 in). Material: Gold. Total metal weight: 3.3 gr. Pear cut London blue topaz (10 x 7 mm) = 2 ct total. Colour: Blue. Stone cut: Pear Cut. Occasion: Wedding, Mother's Day, Graduation. Anniversary: 4th Anniversary. Birthstone: November.