Citrine vs Topaz: How to Tell Them Apart
Last updated: August 2026
Citrine (yellow quartz) and yellow topaz have been tangled together by trade naming for so long that plenty of stones sold as "topaz" are actually citrine — citrine is one of the most common substitutes offered for yellow topaz. The gemology, though, is clean: the RI ranges don't overlap, and topaz is so much denser that the SG difference is the fastest separator — the heft test works on loose stones. One more wrinkle worth knowing: most commercial citrine is itself heat-treated amethyst.
Property Comparison
| Property | Citrine (Quartz) | Topaz | Diagnostic? |
|---|---|---|---|
| SG | 2.63 – 2.65 | 3.49 – 3.57 | Yes |
| RI | 1.544 – 1.553 | 1.609 – 1.643 | Yes |
| Optic Character | DR U+ (uniaxial positive) | DR B+ (biaxial positive) | Yes |
| Hardness | 7 | 8 | Clue |
| Cleavage | None | Perfect (basal) | Clue |
| Crystal System | Trigonal | Orthorhombic | No |
| Birefringence | 0.009 | 0.008 | No |
| Fluorescence (LW) | Inert | Variable | No |
| Luster | Vitreous | Vitreous | No |
The Definitive Tests
- Heft / specific gravity. SG is the fastest separator: topaz reads 3.49–3.57 against citrine's 2.63–2.65. On loose stones of similar size the difference is large enough to feel in the hand — topaz is noticeably heavier for its size. Hydrostatic weighing makes it unambiguous.
- Refractometer. Citrine reads 1.544–1.553; topaz reads 1.609–1.643. The ranges do not overlap, so a single clean reading settles the identification.
- Optic figure (polariscope). Both are doubly refractive, but citrine is uniaxial positive — quartz shows the characteristic 'bull's eye' optic figure — while topaz is biaxial positive. Useful confirmation when the stone is mounted and SG can't be measured.
Common Mistakes
- Trusting the label. Citrine is one of the most common substitutes offered for yellow topaz, and yellow topaz is likewise confused with citrine in the other direction. A stone's sales name is a claim, not an identification — thirty seconds with a refractometer or an SG balance resolves it.
- Identifying by color. The warm reddish-orange "Madeira-type" color of commercial citrine and the yellow-to-orange range of topaz overlap heavily. Color separates nothing here; density and RI separate everything.
- Assuming citrine's own name means natural. Most commercial citrine is heat-treated amethyst; natural citrine is pale yellow and uncommon. This doesn't change the citrine-vs-topaz call (heated amethyst is still quartz, with quartz constants), but it matters for disclosure and value.
- Forgetting topaz's cleavage. Topaz has perfect basal cleavage; quartz has none. It's a durability and handling difference more than a bench test, but a visible cleavage plane in a yellow stone points to topaz — and warns against thermal or mechanical shock.
Frequently Asked Questions
Is citrine a type of topaz?
No. Citrine is the yellow to brownish-orange variety of quartz; topaz is a separate species. Their properties separate cleanly: citrine RI 1.544–1.553 and SG 2.63–2.65 vs topaz RI 1.609–1.643 and SG 3.49–3.57. Citrine is one of the most common substitutes offered for yellow topaz, which is why the names get blurred in the marketplace.
What is the fastest way to tell citrine from topaz?
Specific gravity. Topaz (SG 3.49–3.57) is substantially denser than citrine (SG 2.63–2.65) — the difference is large enough that the heft test works on loose stones of similar size. A refractometer is equally decisive: the RI ranges (1.544–1.553 vs 1.609–1.643) do not overlap.
Is most citrine natural?
Most commercial citrine is heat-treated amethyst. Natural citrine is pale yellow and uncommon; the warm reddish-orange "Madeira-type" color typical of commercial material is produced by heating amethyst. Treated or not, it is still quartz — RI, SG, and optic character are unchanged, so the citrine vs topaz separation works the same way.
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