Gemstone Hardness Scale

MOHS Hardness Scale

The Mohs Scale of hardness is a chart of relative hardness of various minerals and resistance to scratching between minerals. #1 is the softest mineral and #10 is the hardest mineral. It is a relative scale, not proportional, meaning that a mineral with the hardness of 10 will not be twice as hard as a 5.

Diamond	10
Ruby	9
Sapphire	9
Alexandrite	8.5
Chrysoberyl	8.5
Chrysoberyl Cat's Eye	8.5
Spinel	8
Topaz	8
Emerald	7.5-8
Aquamarine	7.5-8
Morganite	7.5-8
Andalusite	7.5
Iolite	7-7.5
Spessartite Garnet	7-7.5
Rhodolite Garnet	7-7.5
Color-Change Garnet	7-7.5
Chrome Tourmaline	7-7.5
Malaia Garnet	7-7.5
Paraiba Tourmaline	7-7.5
Rubellite Tourmaline	7-7.5
Tourmaline	7-7.5
Amethyst	7
Ametrine	7
Citrine	7
Rose Quartz	7
Smoky Quartz	7
Zircon	6.5-7.5
Agate	6.5-7
Axinite	6.5-7
Bloodstone	6.5-7
Chalcedony	6.5-7
Chrysopase	6.5-7
Demantoid Garnet	6.5-7
Diaspore	6.5-7
Kunzite	6.5-7
Peridot	6.5-7
Tanzanite	6.5-7
Tsavorite Garnet	6.5-7
Sugilite	6-6.5
Sunstone	6-6.5
Hematite	5.5-6.5
Mexican Fire Opal	5.5-6.5
Opal	5.5-6.5
Turquoise	5-6
Brazilianite	5.5
Fluorite	4
Coral	3-4
Pearl	2.5-4.5
Amber	2-2.5