Match the beautiful blue of a clear night's sky with the deep blue of these star-shaped tanzanite crystals. Set in a 9ct white gold 5 prong claw setting, the tanzanite crystals have a diameter of 6mm. Stamped with a 375 metal mark and weighing just less than 0.7 grams, these stud earrings have a pin width of 0.65mm and a front to back distance of 13mm.