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The MOHS Scale Systems

The MOHS scale system was developed by Friedrich Mohs, a German gem expert, in 1812. The Mohs scale is still in use today to determine the hardness of most gemstones.

The Mohs scale involves a numerical value- 1 through 10, with 1 being the most easily scratched, and 10 being the most scratch-resistant.

Gem/Mineral

Hardness

Birthstone

*Amber

2.5

 

*Ivory

2.5

 

*Jet

2.5

 

*Mabe Shell

2.5

 

Serpentine

2.5-5.0

 

*Tortoise Shell

2.5

 

Calcite

3.0

 

* Pearl

3.0

June

Azurite

3.5

 

*Coral

3.5

 

Fluorite

4.0

 

Malachite

4.0

 

Rhodocrosite

4.0

 

Apatite

5.0

 

Dioptase

5.0

 

Moldavite

5.0

 

Obsidian

5.0

 

Titanite

5.0

 

Diopside

5.5

 

Lapis

5.5

December

Milarite

5.5

 

Sodalite

5.5

 

Black Opal

6.0

October

Labradorite

6.0

 

Moonstone

6.0

June

Opal

6.0

October

Orthoclase

6.0

 

Rhodonite

6.0

 

Scapolite

6.0

 

Spectrolite

6.0

 

Sunstone

6.0

 

Turquoise

6.0

December

Andradite

6.5

 

Demantoid

6.5

January

Fire opal

6.5

October

Hematite

6.5

 

Nephrite Jade

6.5

 

Peridot

6.5

August

Tanzanite

6.5

December

Kyanite

7.0-5.0

 

Agate

7.0

 

Amethyst

7.0

February

Ametrine

7.0

 

Aventurine

7.0

 

Bloodstone

7.0

March

Blue Chalcedony

7.0

 

Carnelian

7.0

 

Cat's Eye Quartz

7.0

 

Chrysoprase

7.0

 

Gem/Mineral

Hardness

Birthstone

Citrine

7.0

November

Goldenite

7.0

 

Grossular Garnet

7.0

January

Hiddenite

7.0

 

Iolite

7.0

 

Jadeite Jade

7.0

 

Jasper

7.0

 

Kunzite

7.0

 

Mandarin Garnet

7.0

January

Onyx

7.0

 

Petrified Wood

7.0

 

Quartz Crystal

7.0

April

Rhodolite

7.0

January

Rose Quartz

7.0

 

Sard

7.0

 

Sardonyx

7.0

August

Smokey Quartz

7.0

 

Spessartine

7.0

 

Tiger's Eye Quartz

7.0

 

Tsavorite

7.0

January

Hessonite

7.25

January

Pyrope

7.25

January

Almandine Garnet

7.5

January

Andalusite

7.5

 

Aquamarine

7.5

March

Danburite

7.5

 

Emerald

7.5

May

Goshenite

7.5

 

Heliodor

7.5

 

Hyacinth

7.5

 

Indicolite

7.5

 

Morganite

7.5

 

Red Beryl

7.5

 

Rubellite

7.5

 

Sillimanite

7.5

 

Tourmaline

7.5

October

Uvarovite Garnet

7.5

January

Zircon

7.5

December

Blue Topaz

8.0

December

Spinel

8.0

 

Topaz

8.0

November

Alexandrite

8.5

June

Cat's Eye Chrysoberyl

8.5

 

Blue Sapphire

9.0

September

Padparadscha

9.0

September

Ruby

9.0

July

Sapphire

9.0

September

Diamond

10.0

April

Any gemstone listed above can be scratched by a gemstone with the same hardness,
or any harder gemstone farther down the list that is greater than the gem to be tested.

*not technically a gem or mineral, but organic matter

 

 

 

 

 
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