Moh's Scale of Hardness of Common Gemstones

Moh's Scale of Hardness for Common Gemstones

 

Agate = 7

Alexandrite = 8.5

Amber = 2 to 2.5

Amethyst = 7

Apatite = 5

Aquamarine = 7.5 to 8

Aventurine = 7

 

Bloodstone = 7

 

Chalcedony = 7

Charoite = 7 (but chips and cracks easily)

Chrysoberyl = 8.5

Citrine = 7

Coral = 3.5 to 4
Cubic zirconia = 8.5

 

Diopside = 5.5 to 6.5

 

Fluorite = 4

 

Garnet = 7 to 7.5

 

Hematite = 5 to 6.5

 

Iolite = 7 to 7.5

 

Jade = 6.5 to 7

Jasper = 7

 

Kunzite = 6.5 to 7.5

 

Lapis lazuli = 5 to 6

 

Malachite = 3.5 to 4.5 

Moonstone = 6 to 6.5

Morganite = 7.5 to 8

 

Obsidian = 5 to 6

 

Onyx = 7

Opal = 5.5 to 6.5

 

Pearl = 2.5 to 4.5

 

Quartz = 7

 

Rhodochrosite = 3.5 to 4

 

Sardonyx = 7

Sodalite = 5.5 to 6

Spinel = 7.5 to 8

 

 

Tanzanite = 8.5

Topaz = 8

Tourmaline = 7 to 7.5

Turquoise = 5 to 6