London Blue Topaz & Diamond Three Stone Ring in solid 9ct white gold. Size: 19.1 x 6.4 mm (0.75 x 0.25 in). Material: White Gold. Total metal weight: 2.9 gr. Oval cut London blue topaz (7 x 5 mm) = 2.75 ct total. Round brilliant cut diamond (1 x 1 mm, I colour, I1 clarity) = 0.02 ct total. Colour: Blue. Stone cut: Oval Cut. Anniversary: 4th Anniversary. Birthstone: November.