London Blue Topaz & Diamond Earrings in solid 9ct gold. Size: 6.4 x 12.7 mm (0.25 x 0.5 in). Material: Gold. Total metal weight: 1.75 gr. Oval cut London blue topaz (10 x 8 mm) = 5.75 ct total for pair. Round brilliant cut diamond (1.5 x 1.5 mm, L colour, SI1 clarity) = 0.18 ct total for pair. Colour: Blue. Stone cut: Oval Cut. Occasion: Wedding, Mother's Day. Anniversary: 4th Anniversary. Birthstone: November.