- Stishovite: 9.5 on the Mohs scale. ...
- Moissanite: 9.25 on the Mohs scale. ...
- Titanium Carbide: 9-9.5 on the Mohs scale. ...
- Corundum: 9 on the Mohs scale. ...
- Tungsten Carbide: 9 on the Mohs scale. ...
- Chrysoberyl: 8.5 on the Mohs scale. ...
- Cubic Zirconia: 8.5 on the Mohs scale. ...
- Chromium: 8.5 on the Mohs scale.
What is the hardest gemstone to break?
Jadeite Jade is by far the toughest gemstone. It is extremely hard to break and can worn for many years without a crack appearing. A very important factor that affects toughness is cleavage. Cleavage is a weakness at the atomic level within the gemstone that can cause it to easily break.Oct 30, 2013
What are the hardest and second hardest gems?
The ruby and sapphire tie for second-hardest precious stone with a hardness of 9.0 as measured on Mohs scale. (There are many minerals with the same hardness number, and corundum is simply the one selected as the test standard for this hardness.) both rubies and sapphires are made from the mineral corundum.Feb 15, 2009
What gemstone is hardest to break?
Diamond is the hardest natural gem, yet it can chip and split. For example, John's grandmother broke her 3-carat diamond while washing dishes by accidentally hitting it against the side of a stainless-steel sink.
What Stone Cannot be broken?
While diamonds are the hardest in the highest rank, as it is unable to be scratched by any other metal rather than diamond itself. The toughness of a diamond is due to its atomic structure.