Using natural black tourmaline , wrapped in USA 18k gold plated wire. Material: Natural black tourmaline + USA 18K gold plated copper wire + 18k gold bracelet Origin: Handmade in Hong Kong 【Size】： Black tourmaline is about 1 to 1.5cm. Bracelet diameter 6cm Bracelet circumference 18.8cm 【Wire color】： 18K gold plated wire 【Care instrustion】： Please remove it before bathing or swimming. Avoid your jewelry touching chemical such as hairsprays or perfumes. Using soft cloth to clean your jewelry everytime after wearing it, and store it in a dry and cool place. 【Gift packaging】： All products will be packed in a lovely gift box with free of charge. There is no price tag or receipt so that you can send it as a gift directly. If you want to add a note card, please feel free to tell me. 【Shipping】： Hong Kong : Hong Kong Post local registered mail with tracking number. Other countries : All the products will be sent via air registered mail / first class international with tracking number. 【Attention】： Please kindly note that all natural stones are not perfect. They may have cracks and impurities. All jewelries are made by hand and they are not perfect too. Please kindly consider before purchase. Thank you very much.