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1.
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Can be scratched easily with a fingernail
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Sulphur: 1 to 1-1/2
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2.
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Can be scratched with a fingernail
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Amber: 2 to 3
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Ivory: 2 to 4
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3.
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Can be scratched with a coin
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Pearl: 3 to 4
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Coral: 3 to 4
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Malachite: 3-1/2 to 4
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4.
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Can be scratched easily with a knife
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Rhodochrosite: 4
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5.
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Can be scratched with a knife
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Lapis Lazuli: 5 to 6
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Turquoise: 5 to 6
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Opal: 5-1/2 to 6-1/2
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6.
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Can be scratched with a steel file
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Moonstone: 6 to 6-1/2
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Tanzanite: 6-1/2 to 7
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Peridot: 6-1/2 to 7
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Zircon: 6-1/2 to 7-1/2
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7.
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Scratches glass and softer stones
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Citrine: 7
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Amethyst: 7
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Tourmaline: 7 to 7-1/2
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Garnet: 7 to 7-1/2
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Emerald: 7-1/2 to 8
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8.
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Scratches glass and softer stones
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Topaz: 8
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Alexandrite: 8-1/2
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9.
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Scratches glass and softer stones
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Ruby: 9
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Sapphire: 9
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10.
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Scratches glass and softer stones
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Diamond: 10
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