Onyx is another gemstone known since the ancient times. It is a variety of agate with parallel bands of distinctively different colours – light and dark. The name comes from the Greek word onix, which means an animal claw. In the past it was used to make cameos and seals. Onyx is a very popular jewellery material used in rings, bracelets and small jewellery items. It is also a desired collectible gemstone.