A 3mm topaz crystal in a stunning autumnal colour is displayed in these studs with 7.5mm Andralok backs. As topaz is the November birthstone, they would make a great November birthday gift. Made from 9ct yellow gold, the studs measure 8mm from front to back, with a 1mm pin width, and weigh 0.2 grams. These earrings are also available in sterling silver.