Ziamond Sapphires are synthetic Corundum. They possess the same physical, chemical, and optical characteristics of natural sapphires. They are also just as hard, with a hardness of 9 on the Mohs scale. All Ziamond Sapphires are created in a laboratory under the same conditions that nature takes to make genuine Sapphires. They are also hand cut and polished in the same manner as the genuine precious Sapphires. The color of Ziamond Sapphires are the preferred and sought after medium to deep blue.