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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.
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300

140


Gemstone Hardness
Summary Table

Mohs
Hardness
Gemstone
Note
Birthstone

3.5

Azurite

 Blue

 

4.0

Malachite

 Green

 

4.0

Pearl

 White, Pink,
 Yellow, Black

June

<5

Generally considered too soft for gemstones

5.0

Apatite

 Blue, Green

 

5.5

Glass

 Clear

5.5

Chrome Diopside

 Bright green

 

5.5

Turquoise

 Light blue

December

6.0

Jade

 Green

 

6.0

Labradorite

 Blue-green/ Gold

 

6.0

Moonstone

 Bluish White

 

6.0

Opal

 White, Red

October

6.5

Agate

 All colors

 

6.5

Kunzite

 Violet

 

6.5

Tanzanite

 Violet-Blue

 

6.5

Onyx, Chalcedony

 Black

 

6.5

Peridot

 Green

August

7.0

Amethyst

 Purple

February

7.0

Citrine

 Yellow-Orange

 

7.0

Rose Quartz

 Pink

 

7.0

Tiger Eye

 Brown

 

7.0

Tourmaline

 Green AND Red

 

7.0

Zultanite

 Yellow tinge

7.5

Aquamarine

 Greenish-blue

March

7.5

Brazilian Euclase

 Light green

7.5

Garnet

 Tsavorite

January

7.5

Zircon

 Blue, Red

 

8.0

Spinel

 Black, Blue, Brown,
 Green, Purple, Red

 

8.0

Topaz

 Blue, Yellow

November

8.5

Alexandrite

 Green/ Red

 

8.5

Emerald

 Green beryl

May

9.0

Ruby

 Red

July

9.0

Sapphire

 Deep Blue

September

9.5

Moissanite

 Lab-created

10.0

Diamond

 All colors

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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This Vaughns Gemstone Hardness Summary
Chart was last updated on 2015-10-01.