Gemstone hardness scale
The chart below is show the hardness scale of varity gemstones in market trade.
The hardness is the ability to resist scratching. The jewelry trade relies on a unit of measure called the Moh's hardness scale to define the fragile nature of one stone compared to another. About a century ago German gem expert, Friedrich Mohs ,in 1812 and still in used today, created a scale to illustrate this. It is called the Moh’s Scale. He chose ten minerals of varying hardness and gave them each a value. His scale looks like this.
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