The white variety of sapphire is used as a diamond imitation not only because of the diamond-like appearance of this gemstone, but also because of its high durability.
Rated 9 on the Mohs hardness scale, the sapphire is harder than most other stones used as fake diamonds, including the popular cubic zirconia.
However, the white sapphire is less durable than the diamond, which has a hardness degree of 10 on the Mohs scale.