It wouldn't be an easy task to find a more beautiful combination of colours than the deep blue of the sapphire cubic zirconia crystals and 9ct yellow gold these earrings are made from. The sapphire crystals are 2mm in diameter and each earring has a front to back distance of 1.1cm. Weighing just 0.1 grams as a pair, these stud earrings are secured in place by butterfly backs.