Gemstone Mohs Hardness

Hardness is defined as resistance to scratching and is graded between 1 (softest) and 10 (hardest) using the Mohs scale of mineral hardness. Diamond has a hardness of 10 (hardest) on this scale ,it is the hardest natural material known. The gemstone hardness in this chart would help reduce damages while mounting a gemstone in jewellery, and endure the occasional hard knock or abrasion.  
The Moh’s hardness scale was created by a German mineralogist Friedrich Mohs(1773-1839), it mainly measures the scratch resistance of various minerals, through the ability of a harder material to scratch or abrade a softer mineral.
There are ten materials on the Moh’s scale and they are listed from soft to hard, besides their rank, they are given an absolute hardness score.  For instance, talc is the softest mineral and has an absolute hardness score of 1, Diamonds are the hardest material known to man and have an absolute hardness score of 10.  Here is a list of minerals from softest to hardest along with their absolute hardness number:


                                  Gemstones Hardness Chart
Gem

Hardness

GemHardness
Diamond10Jasper6.5 - 7
Star Sapphire9Chrysoprase6.5 - 7
Color-Change Sapphire9Dendritic Agate6.5 - 7
Ruby9Spessartite Garnet6.5 - 7.5
Sapphire9Fire Agate6.5 - 7
Star Ruby9Grossularite Garnet6.5 - 7.5
Chrysoberyl Cat's Eye8.5Star Rose Quartz6.5 - 7
Alexandrite8.5Color-Change Garnet6.5 - 7.5
Chrysoberyl8.5Agate6.5 - 7
Mystic Topaz8Color-Change Diaspore6.5 - 7
Imperial Topaz8Clinohumite6
Spinel8Prehnite6 - 6.5
Topaz8Labradorite6 - 6.5
Azotic Topaz8Cassiterite6 - 7
Rutile Topaz8Nephrite Jade6 - 6.5
Beryl7.5 - 8Sunstone6 - 6.5
Hambergite7.5Moonstone6 - 6.5
Goshenite7.5 - 8Maw-Sit-Sit6 - 7
Morganite7.5 - 8Kyanite6 - 7
Emerald7.5 - 8Jadeite6 - 6.5
Cat's Eye Aquamarine7.5 - 8Andesine Labradorite6 - 6.5
Andalusite7.5Star Moonstone6 - 6.5
Aquamarine7.5 - 8Rainbow Moonstone6 - 6.5
Paraiba Tourmaline7 - 7.5Rainbow Pyrite6 - 6.5
Strawberry Quartz7Orthoclase6 - 6.5
Quartz Cat's Eye7Amazonite6 - 6.5
Kunzite7Sugilite6 - 6.5
Aventurine7Star Sunstone6 - 6.5
Rutile Quartz7Moldavite5.5
Chrome Tourmaline7 - 7.5Moss Opal5.5 - 6.5
Iolite7 - 7.5Sodalite5.5 - 6
Danburite7 - 7.5Rhodonite5.5 - 6.5
Smoky Quartz7Boulder Opal5.5 - 6.5
Rubellite Tourmaline7 - 7.5Fire Opal5.5 - 6.5
Demantoid Garnet7 - 7.5Hematite5.5 - 6.5
Amethyst7Cat's Eye Scapolite5.5 - 6
Cat's Eye Tourmaline7 - 7.5Hackmanite5.5 - 6
Quartz7Nuumite5.5 - 6
Tourmaline7 - 7.5Scapolite5.5 - 6
Dumortierite Quartz7 - 8.5Opal5.5 - 6.5
Star Lemon Quartz7Opal Doublet5.5 - 6.5
Rose Quartz7Smithsonite5
Citrine7Snowflake Obsidian5 - 5.5
Ametrine7Sphene5 - 5.5
Mystic Quartz7Lapis Lazuli5 - 6
Tsavorite Garnet6.5 - 7.5Tremolite-Hexagonite5 - 6
Onyx6.5 - 7Star Diopside5 - 6
Peanut Wood6.5 - 7Cat's Eye Apatite5
Tiger's Eye6.5 - 7Obsidian5 - 5.5
Sillimanite Cat's Eye6.5 - 7.5Turquoise5 - 6
Ruby-Zoisite6.5 - 7Tashmarine Diopside5 - 6
Hiddenite6.5 - 7Hemimorphite5
Zircon6.5 - 7.5Apatite5
Bloodstone6.5 - 7Chrome Diopside5 - 6
Hessonite Garnet6.5 - 7.5Gaspeite4.5 - 5
Cat's Eye Diaspore6.5 - 7Charoite4.5 - 5
Almandine Garnet6.5 - 7.5Larimar4.5 - 5
Carnelian6.5 - 7Fluorite4
Pyrope Garnet6.5 - 7.5Variscite4 - 5
Fossil Coral6.5 - 7Rhodochrosite4
Spodumene6.5 - 7Ammolite4
Agate Geode6.5 - 7Sphalerite3.5 - 4
Star Garnet6.5 - 7.5Malachite3.5 - 4
Chalcedony6.5 - 7Azurite3.5 - 4
Rhodolite Garnet6.5 - 7.5Coral3 - 4
Mali Garnet6.5 - 7.5Verdite3
Axinite6.5 - 7Calcite3
Idocrase6.5Pearl2.5 - 4.5
Melanite6.5 - 7Lepidolite2.5 - 3
Tanzanite6.5 - 7Seraphinite2 - 4
Tiger's Eye Matrix6.5 - 7Chrysocolla2 - 4
Peridot6.5 - 7Amber2 -