Swiss Blue Topaz & Diamond Pendant Necklace in solid 9ct gold. Size: 6.4 x 19.1 mm (0.25 x 0.75 in). Material: Gold. Total metal weight: 1.2 gr. Pear cut Swiss blue topaz (12 x 8 mm) = 3.25 ct total. Round brilliant cut diamond (1 x 1 mm, L colour, SI1 clarity) = 0.03 ct total. Colour: Blue. Stone cut: Pear Cut. Occasion: Mother's Day. Anniversary: 4th Anniversary. Birthstone: November.