The specification for Smyoue's 1CT 2CT 4CT Heart Cut Moissanite Stud Earrings boasts the following details. The brand is Star you, originating from Mainland China. A third-party appraisal is not included, but the product is made of quality materials such as 925 sterling silver and VVS moissanite. The earrings are available in 6.5mm, 8mm, and 10mm sizes and come with a GRA certification. With a hardness of 9.25, moissanite is a durable alternative to diamonds that also offers a high fire and affordable pricing.