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Gemstone Moh’s Hardness Scale

Mohs Hardness Scale

The Moh’s hardness scale refers to scratch hardness. The resistance of one mineral to be scratched by another.

Friedrich Mohs (1773-1839), a Viennese mineralogist, introduced the term scratch hardness. The scale ranges from the softest at 1 through to the hardest at 10. Gemstones with a hardness of 1 and 2 are considered to be soft, from 3 to 5 medium, with 6 and over considered to be hard.

Because dust can contain quartz, it is important to realise that household dust can damage the lustre and brilliance of gemstones with a hardness below 7. Jewellery set with these stones should be well cared for to maintain their continued brilliance.

This table of Moh’s hardness lists gemstones by name alphabetically.

A B CD E F G HI J K L M N O PQ R S T U V W X Y Z

A B C

GemstoneHardness
Aegirine6
Alexandrite8 ½
Almandine7-7 ½
Amazonite6-6 ½
Amblygonite6
Amethyst7
Andalusite
Andesine 6-6 ½
Anorthoclase 6-6 ½
Aquamarine7½-8
Aventurine7
Axinite6 ½ -7
Benitoite 6-6 ½
Bytownite 6-6 ½
Bixbyite 6-6 ½
Boracite7-7 ½
Cassiterite6-7
Chalcedony6 ½ -7
Chambersite7
Chondroite 6-6 ½
Chromdravite7
Chrysoberyl
Chrysoprase6 ½ -7
Citrine7
Clinohumite6
Clinozoisite6-7
Cordierite7-7 ½
Covellite1½ -2

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