As well as being the September birthstone, these sapphire crystals give your look a small dash of sparkly blue to add a little colour to your day. A great gift for a September birthday girl who enjoys wearing small studs, the earrings are made from 9ct yellow gold with a front to back distance of 8mm and 1mm pin width. The sapphire crystals have a diameter of 3mm. 7.5mm Andralok levers secure the earrings in place without the need for loose backs.