> This table sums up, for the main stones, their colour, the use tradition assigns them, and their hardness on the Mohs scale — a practical reference for cho

*Source : https://meilleures-bijouteries.fr/en/guides/crystal-properties-table/*

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● Guide

# Crystal properties table (colour, use, hardness)

Published on **26/07/2026** · By **Sébastien Joumel**

In brief

**This table sums up, for the main stones, their colour, the use tradition assigns them, and their hardness on the Mohs scale — a practical reference for choosing and knowing whether a stone suits daily wear.** The uses are traditional and replace no medical advice.

## The summary table

Stone

Colour

Use (tradition)

Hardness (Mohs)

[Amethyst](https://meilleures-bijouteries.fr/en/guides/amethyst-benefits/)

Purple

Calm

7

[Rose quartz](https://meilleures-bijouteries.fr/en/guides/rose-quartz-benefits/)

Pink

Gentleness, self-love

7

[Citrine](https://meilleures-bijouteries.fr/en/guides/citrine-benefits/)

Yellow

Joy, confidence

7

[Tiger's eye](https://meilleures-bijouteries.fr/en/guides/tigers-eye-benefits/)

Golden brown

Protection, confidence

7

[Carnelian](https://meilleures-bijouteries.fr/en/guides/carnelian-benefits/)

Orange-red

Vitality, creativity

7

[Red jasper](https://meilleures-bijouteries.fr/en/guides/red-jasper-benefits/)

Brick red

Grounding, energy

7

[Aventurine](https://meilleures-bijouteries.fr/en/guides/aventurine-benefits/)

Green

Luck, calm

7

[Garnet](https://meilleures-bijouteries.fr/en/guides/garnet-benefits/)

Deep red

Passion, vitality

6.5-7.5

[Black tourmaline](https://meilleures-bijouteries.fr/en/guides/black-tourmaline-benefits/)

Black

Protection, grounding

7-7.5

[Aquamarine](https://meilleures-bijouteries.fr/en/guides/aquamarine-benefits/)

Light blue

Serenity

7.5-8

[Amazonite](https://meilleures-bijouteries.fr/en/guides/amazonite-benefits/)

Water green

Calm, communication

6-6.5

[Labradorite](https://meilleures-bijouteries.fr/en/guides/labradorite-benefits/)

Iridescent grey

Energy protection

6-6.5

[Moonstone](https://meilleures-bijouteries.fr/en/guides/moonstone-benefits/)

Bluish white

Femininity, intuition

6-6.5

[Lapis lazuli](https://meilleures-bijouteries.fr/en/guides/lapis-lazuli-benefits/)

Ultramarine

Wisdom, truth

5-5.5

[Obsidian](https://meilleures-bijouteries.fr/en/guides/obsidian-benefits/)

Glassy black

Protection (brittle)

5-5.5

[Turquoise](https://meilleures-bijouteries.fr/en/guides/turquoise-benefits/)

Blue-green

Protection (porous)

5-6

[Malachite](https://meilleures-bijouteries.fr/en/guides/malachite-benefits/)

Banded green

Transformation (fragile, copper)

3.5-4

[Howlite](https://meilleures-bijouteries.fr/en/guides/howlite-benefits/)

Veined white

Calm, sleep (soft)

3.5

## How to read this table

The **hardness** column is decisive for use: above **6.5-7**, the stone suits a daily bracelet; below (turquoise, lapis, malachite, howlite), keep it for protected wear (pendant, earrings). The **use** is the traditional one — see each page and our [meaning of crystals](https://meilleures-bijouteries.fr/en/guides/meaning-of-crystals/) guide.

## Sources & references

-   **Mohs scale**: relative hardness of minerals (1 talc → 10 diamond).
-   **French National Museum of Natural History** ([mnhn.fr](https://www.mnhn.fr)): mineralogy.
-   **DGCCRF** ([economie.gouv.fr/dgccrf](https://www.economie.gouv.fr/dgccrf)): health claims. _The uses listed are wellbeing traditions._

## Frequently asked questions

Which stone for which use?

By tradition: amethyst for calm, rose quartz for gentleness, citrine for confidence, tiger's eye and black tourmaline for protection, carnelian and garnet for energy. The table above sums up colour, use and hardness for each stone.

What hardness for a daily bracelet?

Aim for 6.5 to 7 minimum on the Mohs scale (quartz, agate, tiger's eye, aventurine). Below that, like turquoise, malachite or howlite, the stone wears quickly: keep it for occasional, protected wear.

Is this virtues table scientifically reliable?

The hardness figures are reliable mineralogical data. The "uses", however, are wellbeing traditions, not scientifically demonstrated, and replace no medical advice.

## Read also

[

Guide

Amazonite: virtues, calm and communication

](https://meilleures-bijouteries.fr/en/guides/amazonite-benefits/)[

Guide

Amethyst: virtues, meaning and how to wear it

](https://meilleures-bijouteries.fr/en/guides/amethyst-benefits/)[

Guide

Aquamarine: virtues, serenity and meaning

](https://meilleures-bijouteries.fr/en/guides/aquamarine-benefits/)

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