The beads are Rhodonite & Black Onyx. The clasp is a sterling lobster. Rhodonite is a Manganese Iron Magnesium Calcium Silicate Rhodonite is typically pink to red or orange and even black. It's beautiful pink color often has black manganese oxide veins running through it, giving it a distinct appearance. For this reason it is carved into beads, cabochons, and ornamental objects. In 18th century Russia, it was used extensively for decorating the Russian court.