Topaz vs Citrine
Topaz is harder (Mohs 8) than Citrine (Mohs 7), so it resists scratching better.
Topaz has the higher refractive index (1.609–1.643 vs 1.544–1.553), which a refractometer can use to separate them.
Topaz is denser (SG 3.53 vs 2.65); a topaz of the same size weighs about 33% more.
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| Property | Topaz | Citrine |
|---|---|---|
| Species / material | Topaz | Quartz |
| Mohs hardness | 8 | 7 |
| Refractive index | 1.609–1.643 | 1.544–1.553 |
| Specific gravity | 3.53 | 2.65 |
| Crystal system | Orthorhombic | Trigonal |
| Birefringence | 0.008–0.010 | 0.009 |
Values are typical ranges from standard gemmological references; individual stones can vary.