Amethyst vs Citrine
Amethyst and Citrine have similar hardness (Mohs 7).
Both are varieties of Quartz; they differ mainly in colour, so standard tests (RI, SG) overlap.
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| Property | Amethyst | Citrine |
|---|---|---|
| Species / material | Quartz | Quartz |
| Mohs hardness | 7 | 7 |
| Refractive index | 1.544–1.553 | 1.544–1.553 |
| Specific gravity | 2.65 | 2.65 |
| Crystal system | Trigonal | Trigonal |
| Birefringence | 0.009 | 0.009 |
Values are typical ranges from standard gemmological references; individual stones can vary.
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