925 Sterling Silver Black Stone Claw Men's Ring Product Features Produced with 925 sterling silver. Onyx stone is used. It weighs approximately 15 grams. Weight may vary depending on ring size. There are black stone and claw figures on the ring. Stone dimensions are approximately 1.5 cm from left to right; about 2 cm from top to bottom. You can learn your ring size from the jeweler free of charge.