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Gem Hardness Image Alexandrite 8.5 Amethyst 7 Aquamarine 7.5 Citrine 7 Diamonds 10 Emeralds 7.5 Garnets 7 - 7.5 Jade 6.5 - 7.0 Onyx 7 Opal 6.0 - 6-5 Pearls 3 Peridot 6.5 Ruby 9 Sapphire 9 Tanzanite 6.5 Topaz 9 Tourmaline 7.5 Zircon 7.5 Cubic Zirconia 8.5 - 9.0 Moissanite 9.25 Cornelian 7 Sardonyx 7 Agate 7 Turquoise 5 - 6 Moonstone 6 - 6.25 Bloodstone 6.5 - 7.0 Jasper 6.5 - 7.0 Malachite 3.5 - 4.0 Sunstone 6 - 7.2 Iolite 7 - 7.5 Lapis 5 - 5.5 Cat's Eye 8.5 Spinel 8.5