Amethyst
QuartzJewelryWiki Editorial·3 sources·Reviewed 2026-07-31
The purple variety of quartz, and the most common gem at hardness 7 — the traditional threshold for everyday wear.
Properties
| Property | Value | Authority |
|---|---|---|
| Mohs hardness | 7 [1] | — |
| Crystal system | Trigonal [3] Read from the species article, Quartz. | — |
| Birthstone month | February [2] | — |
Sources
- International Gem Society — reference charts (Mohs hardness, specific gravity, refractive index) — International Gem Society (IGS reference charts)
- Jewelers of America — Birthstones — Jewelers of America (Jewelers of America, Birthstones)
- Wikipedia — mineral article infoboxes (crystal system) — Wikipedia contributors (Wikipedia mineral infoboxes)