Heart Shaped London Blue Topaz & Diamond Pendant Necklace in solid 9ct white gold. Size: 11.1 x 19.1 mm (0.44 x 0.75 in). Material: White Gold. Total metal weight: 1.0 gr. Heart shaped London blue topaz (10 x 10 mm) = 4 ct total. Round brilliant cut diamond (1 x 1 mm, I colour, I1 clarity) = 0.025 ct total. Colour: Blue. Stone cut: Heart Shaped. Anniversary: 4th Anniversary. Birthstone: November.