Calcite -3, fluorite -4, apatite -5, orthosite -6, quartz -7

The hardness of gemstones is closely related to their antiwear properties, and is an important factor determining the of gemstones. There are two kinds of determination of hardness of jewels, indirect and direct methods.
Morse / Mohs hardness pen is used in Mohs / Mohs hardness tester.Calcite -3, fluorite -4, apatite -5, orthosite -6, quartz -7Five ores are set on five metal poles, and the edges and corners of these ores are used to mark the to determine the hardness of the . If the scratch is left, the hardness of the is than that of the hardness of the hardness pen. If the scratch is not moved, the hardness of the is higher than that of the hardness pen.