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All About Jewels:
Illustrated Dictionary of Jewelry
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.

Moh's Scale

The Mohs Scale of Hardness measures a substance's hardness, that is, how resistant that substance is to being scratched. This scale was invented by Austrian mineralogist Friedrich Mohs (1773-1839).

In the Mohs scale, one substance is harder than another if it can scratch it. The scale ranges from 1 to 10. For example, a diamond (hardness = 10) will scratch garnet (hardness = 6.5-7.5), but not the other way around, so a diamond is harder than garnet.

SubstanceHardness
Talc1
Amber, Fingernail, Ivory, Shell, Jet2.5
Gold2-3
Bronze, Coral, Pearl3
Azurite3.5-4
Iron4
Glass5
Lapis lazuli5-5.5
Turquoise5-6
Opal5.5-6.5
Moonstone6-6.5
Peridot6.5
Jade6.5-7
Amethyst, Chalcedony, Quartz, Steel (pocket knife)7
Garnet6.5-7.5
Tourmaline7-7.5
Zircon7.5
Aquamarine, Emerald7-8
Spinel, Topaz8
Chrysoberyl8.5
Ruby, Sapphire9
Diamond10

All About Jewels:
Illustrated Dictionary of Jewelry
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the jewelry term you are looking for is not in the dictionary, please e-mail me and I'll add it.




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