The Durability of Diamonds
A diamond gemstone is the hardest natural material on the planet. It is for this reason that diamonds or diamond dust is used in the cutting or shaping of other diamonds. Many gems are very hard indeed but diamond is at the top of the league.
There is a special scale which is used to measure the hardness of substances which is known as Mohs scale or test, so named after its inventor Friedrich Mohs in 1822. This scale ranges from the hardest factor at 10 to the softest at 1. The sectional divides on the scale or not equal and depend upon various factors. For a substance to fit into hardness 9-10 equates to a much higher level of hardness than 8-9. Talc is deemed to be the softest of substances measuring 1, which means it can easily be scratched with a fingernail.
The harder the substance, damage such as scratching or chipping is far less likely. Therefore it makes sense that the hardest minerals and gems are used for jewelry as their ability to take rough handling, heat, chemicals or being knocked or dropped make them ideal for the job.
A common mineral such as quartz, which is a mixture of citrine and amethyst, will fit the scale at 7+ whilst red rubies and blue sapphires are almost as hard as the diamond at a scale of 9.

