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Jewelry

Gemstone Hardness Summary Chart
by Vaughn Aubuchon

This simplified gemstone hardness chart summarizes the resistance to scratching of selected jewellery gemstones. The chart also lists official birthstones for each month.

30

100

60

30

80

80

30


Gemstone Hardness Summary Table
Mohs
Hardness
Gemstone
Note
Birthstone

3.5

Azurite

 

 

4.0

Malachite

 

 

4.0

Pearl

 

June

<5

Generally considered too soft for gemstones

 

5.0

Apatite

 

 

5.5

Glass

5.5

Russian Diopside

Chrome Diopside

 

5.5

Turquoise

 

December

6.0

Jade

 

 

6.0

Labradorite

 

 

6.0

Moonstone

 

 

6.0

Opal

 

October

6.5

Agate

 

 

6.5

Kunzite

 

 

6.5

Tanzanite

 

 

6.5

Onyx

Chalcedony

 

6.5

Peridot

 

August

7.0

Amethyst

Quartz

February

7.0

Citrine

 

 

7.0

Rose Quartz

 

 

7.0

Tiger Eye

 

 

7.0

Tourmaline

 

 

7.5

Aquamarine

 

March

7.5

Brazilian Euclase

7.5

Garnet

Tsavorite

January

7.5

Zircon

 

 

8.0

Spinel

 

 

8.0

Topaz

 

November

8.5

Alexandrite

 

 

8.5

Emerald

Green beryl

May

9.0

Ruby

 

July

9.0

Sapphire

 

September

9.5

Moissanite

Lab-created

10.0

Diamond

 

April


Any gemstone listed above can be scratched by any gemstone with the same hardness,
or any harder gemstone farther down the list.

75

150-450

150

75


DISCLAIMER
Although the author has tried to be as accurate as possible, errors are possible.

I could not find a simplified gemstone hardness table like the above. So, I made this gemstone chart, to help myself understand the relationships between the hardness of various common gem stones. I hope that it helps you.

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©2005 Vaughn Aubuchon
www.vaughns-1-pagers.com
All Rights Reserved
This Vaughns Gemstone Hardness Summary Chart
was last updated on 2013-11-15.