Authenticity and support for authentication. Product Name: Natural Crystal Cup (Original Stone Processed at High Temperature)! Material: Made of pure natural white crystal raw stone! Craftsmanship: Natural white crystal raw stone is hand carved, polished, and polished at a high temperature of 1600 degrees Celsius, without any glass or added lead. Support identification. Regarding crystal heating: Cups made from pure natural crystals without heating treatment cannot hold hot water. Cups carved from pure natural untreated raw stones can only be enjoyed and collected. Regarding price: Natural crystal raw stones are heated, resulting in higher costs. They will be manually carved in the later stage, and each cup will be different. After selection, they will be shipped randomly. Regarding flaws: Natural crystal raw stones are used, and each cup has natural cotton and other flaws that cannot be avoided. They are selected and sent out.                   

Other: Design, cutting, carving, polishing, sandblasting, polishing, all are purely handmade, and each cup is different. Welcome to customize with pictures. If out of stock, wait for up to 10 days