Sapphires are not only the bright blue stones but also gray or gray-blue. The sapphire belongs to the corundum group, just like the ruby, which, however, is always red. If a red corundum not then he will tend referred to as sapphire. Our Sapphire Tumbled therefore have a gray to blue.
Sapphire is a very hard material to work is not easy to drill and the sapphire is not easy.

Size: 20 to 30 mm