Handmade natural gemstones ring, Unique jewelry for women, Beautiful gift for a birthday, anniversary, christmas, gradution. The ring has reactangular shape and size of gemstone – 15mm X 7mm The ring is made of 925 sterling silver. All of natural rocks by kala jewelry is handmade with love and passion, You are more than welcome to visit my shop for more jewelry designs. All my Jewelry will be sent in a gift box with lots of love and care. If you have any questions about jewelry, we will answer promptly. Handmade, natural product Stone: Black Toumaline Metal: 925 Solid Sterling Silver. Black Tourmaline is considered one of the best stones for psychic protection.