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Hardness of gemstones by Mohs' scale

Acate

6.5-7

Akvamarine

7.5-8

Alabaster

2

Aleksandrite

8.5

Amazonite

6-6.5

Amethyst

7

Atsurite

3.5-4

Beryll

7.5-8

Diopside

5-6

Fluorite

4

Garnet

6.5-7.5

Heliodor

7.5-8

Pearl

3-4

Hematite

5.5-6.5

Silver

2.5-3

Jadeite

6.5-7

Jasper

6.5-7

Carneol

6.5-7

Coral

3-4

Cordierite

7-7.5

Chrysocolla

2-4

Chrysoprase

6.5-7

Gold

2.5-3

Kunzite

6-7

Moonstone

2.5-3

Labradorite

6-6.5

Lazurite

5-6

Malachite

3.5-4

Amber

2-2.5

Morganite

7.5-8

Nefrite

6-6.5

Obsidian

5-6

Opal

5.5-6.5

Peridot

6.5-7

Platinum

4-4.5

Rhodochrosite

4

Rhodonite

5.5-6.5

Ruby

9

Rose quartz

7

Sapphire

9

Smoke quartz

7

Serpentine

2.5-5

Citrine

7

Emerald

7.5-8

Sodalite

5.5-6

Spectrolite

6-6.5

Spinel

8

Tanzanite

6.5-7

Tiger's eye

7

Diamond

10

Topaz

8

Turquoise

5-6

Tourmaline

7-7.5

Rock Crystal

7

Zircon

6.5-7.5