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Mohs Scale of Hardness
What is Mohs scale?
German mineralogist, Friedrich Mohs created a scale of mineral
hardness that is still used as a standard to measure the
hardness of gemstones and other minerals. His scale is based
the scratch resistance of ten minerals that are readily available
and gives the hardness on a scale of 1 to 10 where diamonds
are the hardest material and therefore score a 10.
The hardness of a material is measured on the scale by finding
the hardest material the given material can scratch. For example,
since a ruby can be scratched by a diamond (a Mohs 10), but
cannot be scratched by a yellow topaz (a Mohs 8), it's Mohs
hardness falls between a 10 and an 8, making the hardness of a
ruby around a 9.
The Mohs scale is depicted to the right. While the scale is very
useful, it cannot be used as a scale of absolute hardness (that
measured by a sclerometer).
German mineralogist, Friedrich Mohs created a scale of mineral
hardness that is still used as a standard to measure the
hardness of gemstones and other minerals. His scale is based
the scratch resistance of ten minerals that are readily available
and gives the hardness on a scale of 1 to 10 where diamonds
are the hardest material and therefore score a 10.
The hardness of a material is measured on the scale by finding
the hardest material the given material can scratch. For example,
since a ruby can be scratched by a diamond (a Mohs 10), but
cannot be scratched by a yellow topaz (a Mohs 8), it's Mohs
hardness falls between a 10 and an 8, making the hardness of a
ruby around a 9.
The Mohs scale is depicted to the right. While the scale is very
useful, it cannot be used as a scale of absolute hardness (that
measured by a sclerometer).
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Vintage Jewelry Glossary
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Fashion and Jewelry Etiquette
History of Jewelry
Rhinestone Types and Finishes
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