Bold man's sterling silver ring inlaid with black onyx, gem silica and chalcosiderite. Chalcosiderite is the green stone with the black webbing inlaid in the center and end sections. Chalcosiderite has similar properties to turquoise and it is often found near a turquoise formation. The blue stone between the black onyx pieces is gem silica. Gem silica is a very hard stone and is somewhat translucent. This ring measures 9.5mm wide and is a size 10 1/4. The ring is available in other sizes and stone choices by special order.