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Gem Talk - Hardness Hardness is one of the several, key parameters used in qualitative analysis of the gemstones. It is measured by how well a stone resists scratching. In 1812 the German mineralogist Frederich Mohs (1773-1839), developed Mohs scale of mineral hardness. He selected the ten minerals since they were common and readily available. He took these minerals and put them in order of “scratchability”: each one will scratch those below it on the scale but will be scratched by those above it. The scale is not a linear scale, but somewhat arbitrary. For example, corundum (9) is twice as hard as topaz (8), but diamond (10) is almost four times as hard as corundum. Hardness Mineral 1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond Every stone can be tested and classified using the Mohs scale of hardness. Hardness testing is destructive, however, and should be used on the gemstones only if all other tests fail.

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Gem Talk - Hardness

Gem Talk - Hardness

Gem Talk - Hardness

Contributed by Mirko Davidovic on March 11, 2008, at 6:07 PM UTC.

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This intel was contributed by Mirko Davidovic Mirko Davidovic

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