Sterling Silver with 0.50ctw Lab Created Moissanite & Blue Topaz Round Halo Stud Earrings. Celebrate the next birthday or any loved one, or treat yourself to these blue topaz (December birthstone) earrings, beautifully crafted in sterling silver. Glittering round brilliant cut lab created moissanites prong set in dazzling halo cluster around each center stone gives these inviting earrings a vintage vibe and have VVS1 clarity and D color. Butterfly backs keep these studs secure. 0.50ctw. Measurement 8.7mm 2 Butterfly clasp Polished finish Imported Product Specifications 8.7mm Material & Care Sterling silver Clean with a soft cloth.