All the gemstone saw today have hardness 7 in Mohs scale, except one. Which one?
Prasiolite
Topaz
Amethyst
Pink Quartz
Smoky Quartz
Birthstone match
Topaz
June
Prasiolite
November
Pink Quartz
August
Smoky Quarts
January
Amethyst
February
What's Moh's scale is measuring?
Hardness
Toughness
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