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Gemstone Hardness Chart
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. 
 
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Gemstones Hardness Chart
Gem

Hardness

 Gem Hardness
Diamond 10 Jasper 6.5 - 7
Star Sapphire 9 Chrysoprase 6.5 - 7
Color-Change Sapphire 9 Dendritic Agate 6.5 - 7
Ruby 9 Spessartite Garnet 6.5 - 7.5
Sapphire 9 Fire Agate 6.5 - 7
Star Ruby 9 Grossularite Garnet 6.5 - 7.5
Chrysoberyl Cat's Eye 8.5 Star Rose Quartz 6.5 - 7
Alexandrite 8.5 Color-Change Garnet 6.5 - 7.5
Chrysoberyl 8.5 Agate 6.5 - 7
Mystic Topaz 8 Color-Change Diaspore 6.5 - 7
Imperial Topaz 8 Clinohumite 6
Spinel 8 Prehnite 6 - 6.5
Topaz 8 Labradorite 6 - 6.5
Azotic Topaz 8 Cassiterite 6 - 7
Rutile Topaz 8 Nephrite Jade 6 - 6.5
Beryl 7.5 - 8 Sunstone 6 - 6.5
Hambergite 7.5 Moonstone 6 - 6.5
Goshenite 7.5 - 8 Maw-Sit-Sit 6 - 7
Morganite 7.5 - 8 Kyanite 6 - 7
Emerald 7.5 - 8 Jadeite 6 - 6.5
Cat's Eye Aquamarine 7.5 - 8 Andesine Labradorite 6 - 6.5
Andalusite 7.5 Star Moonstone 6 - 6.5
Aquamarine 7.5 - 8 Rainbow Moonstone 6 - 6.5
Paraiba Tourmaline 7 - 7.5 Rainbow Pyrite 6 - 6.5
Strawberry Quartz 7 Orthoclase 6 - 6.5
Quartz Cat's Eye 7 Amazonite 6 - 6.5
Kunzite 7 Sugilite 6 - 6.5
Aventurine 7 Star Sunstone 6 - 6.5
Rutile Quartz 7 Moldavite 5.5
Chrome Tourmaline 7 - 7.5 Moss Opal 5.5 - 6.5
Iolite 7 - 7.5 Sodalite 5.5 - 6
Danburite 7 - 7.5 Rhodonite 5.5 - 6.5
Smoky Quartz 7 Boulder Opal 5.5 - 6.5
Rubellite Tourmaline 7 - 7.5 Fire Opal 5.5 - 6.5
Demantoid Garnet 7 - 7.5 Hematite 5.5 - 6.5
Amethyst 7 Cat's Eye Scapolite 5.5 - 6
Cat's Eye Tourmaline 7 - 7.5 Hackmanite 5.5 - 6
Quartz 7 Nuumite 5.5 - 6
Tourmaline 7 - 7.5 Scapolite 5.5 - 6
Dumortierite Quartz 7 - 8.5 Opal 5.5 - 6.5
Star Lemon Quartz 7 Opal Doublet 5.5 - 6.5
Rose Quartz 7 Smithsonite 5
Citrine 7 Snowflake Obsidian 5 - 5.5
Ametrine 7 Sphene 5 - 5.5
Mystic Quartz 7 Lapis Lazuli 5 - 6
Tsavorite Garnet 6.5 - 7.5 Tremolite-Hexagonite 5 - 6
Onyx 6.5 - 7 Star Diopside 5 - 6
Peanut Wood 6.5 - 7 Cat's Eye Apatite 5
Tiger's Eye 6.5 - 7 Obsidian 5 - 5.5
Sillimanite Cat's Eye 6.5 - 7.5 Turquoise 5 - 6
Ruby-Zoisite 6.5 - 7 Tashmarine Diopside 5 - 6
Hiddenite 6.5 - 7 Hemimorphite 5
Zircon 6.5 - 7.5 Apatite 5
Bloodstone 6.5 - 7 Chrome Diopside 5 - 6
Hessonite Garnet 6.5 - 7.5 Gaspeite 4.5 - 5
Cat's Eye Diaspore 6.5 - 7 Charoite 4.5 - 5
Almandine Garnet 6.5 - 7.5 Larimar 4.5 - 5
Carnelian 6.5 - 7 Fluorite 4
Pyrope Garnet 6.5 - 7.5 Variscite 4 - 5
Fossil Coral 6.5 - 7 Rhodochrosite 4
Spodumene 6.5 - 7 Ammolite 4
Agate Geode 6.5 - 7 Sphalerite 3.5 - 4
Star Garnet 6.5 - 7.5 Malachite 3.5 - 4
Chalcedony 6.5 - 7 Azurite 3.5 - 4
Rhodolite Garnet 6.5 - 7.5 Coral 3 - 4
Mali Garnet 6.5 - 7.5 Verdite 3
Axinite 6.5 - 7 Calcite 3
Idocrase 6.5 Pearl 2.5 - 4.5
Melanite 6.5 - 7 Lepidolite 2.5 - 3
Tanzanite 6.5 - 7 Seraphinite 2 - 4
Tiger's Eye Matrix 6.5 - 7 Chrysocolla 2 - 4
Peridot 6.5 - 7 Amber 2 - 2.5

Note: A fingernail has a hardness of 2; a copper penny, about 3; a knife blade, 5; window glass, 5.5; and a steel file, 6.5.