How Do I Tell the Difference Between Real and Fake Citrine?

The fastest way to tell real citrine from fake is a scratch test — citrine is quartz, Mohs 7 hardness, specific gravity 2.651, so glass and plastic simulants fail on contact. The harder question is whether a genuine piece of quartz is natural citrine or heat-treated amethyst, and the best clues are color zoning visible under magnification and the fact that heat-treated stones may fade when exposed to prolonged heat.

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Last updated: September 12, 2026

By Mara Ellison · Founding Editor, Dusk & Relic Journal

Why Is Most "Citrine" Actually Heated Amethyst?

Natural citrine is uncommon compared to amethyst, so heating amethyst to produce a yellow color is standard practice in the gem trade. The supply chain adds a layer of difficulty. According to the USGS Mineral Commodity Summaries (February 2026), U.S. net import reliance for gemstones was 99% of apparent consumption every year from 2021 through 2025. The same report notes that glass, plastics, and other materials are frequently substituted for natural gemstones.

Heated amethyst is still quartz — Mohs 7, specific gravity 2.651. The issue is disclosure, not mineral identity. If you want stone that was yellow in the ground, you need tests that go beyond confirming quartz.

Does Real Citrine Pass a Scratch Test?

Yes. Citrine registers 7 on the Mohs hardness scale, hard enough to scratch a glass plate or a steel knife blade. If a yellow bead fails this test, the bead is not quartz — and the USGS lists glass and plastics among common gemstone simulants.

If a bead does not scratch glass it is not citrine, and if the bead does scratch glass but shows no color zoning under a loupe, the quartz was likely heated. The scratch test eliminates glass and plastic fakes in seconds but does not distinguish natural citrine from heat-treated amethyst, because both are Mohs 7.

What Should Citrine Look Like Under Magnification?

Under magnification, natural quartz shows color zoning alongside two- and three-phase inclusions and negative crystals (International Gem Society). A bead with no visible internal features and perfectly uniform color from edge to edge warrants closer examination.

Color zoning is the most accessible check — in natural citrine, yellow concentrates in uneven bands that follow the crystal's growth planes. Clear quartz shows the same family of growth features, confirming the pattern is standard across quartz varieties.

I'd rank color zoning as the single most useful field test for citrine authentication: the check takes seconds with a loupe and addresses the one thing a scratch test cannot, which is whether the quartz color is natural.

Will Heat-Treated Citrine Fade Over Time?

Heat-treated citrine may fade when exposed to heat, according to the International Gem Society. Prolonged direct sunlight or a hot surface can shift the color over months. The change is gradual — not useful as a quick store test — but citrine that steadily loses saturation after outdoor wear is showing signs of heat treatment.

A closer look at how heated citrine responds differently from natural citrine over time helps set expectations before buying. Bracelets with raw or minimally polished citrine — like the Sunstruck bracelet (8mm, $115) — preserve surface growth texture that makes natural origin easier to confirm before heat stability becomes a concern.

Can Specific Gravity and Refractive Index Confirm Citrine?

Yes. Citrine measures 2.651 specific gravity and 1.544–1.553 refractive index (International Gem Society). Clear quartz shares these exact values — both are quartz — so the tests confirm the mineral rather than the color variety.

Property	Citrine / Quartz Value	Equipment
Mohs Hardness	7	Glass plate
Specific Gravity	2.651	Hydrostatic balance
Refractive Index	1.544–1.553	Refractometer

Neither SG nor RI testing is practical at home, but both give a definitive answer when a jeweler suspects glass or plastic. The Dusk & Citrine bracelet (10–11.5mm, $95) and the Happiness Is bracelet (11mm, $90) both carry citrine beads sized for individual testing against these reference numbers.

What Should You Ask When Buying a Citrine Bracelet Online?

Ask the seller whether the citrine is natural or heat-treated, and whether they can provide a close-up photograph of the beads under magnification. Sellers who disclose treatment history up front tend to carry more reliable material.

For a bracelet you plan to authenticate on arrival, larger beads make every test easier — color zoning and inclusions are far more visible on a bigger surface. The Dusk & Citrine (10–11.5mm, $95) places citrine next to amethyst on the same strand, making direct color comparison between the two quartz varieties possible on one wrist. A detailed guide to how natural citrine differs from heat-treated amethyst in bracelet form covers what that comparison reveals.

FAQ

Is heat-treated citrine still real quartz?

Yes. Heat-treated citrine is still quartz with Mohs 7 hardness and 2.651 specific gravity. The treatment changes color, not mineral identity.

Can citrine scratch glass?

Citrine registers 7 on the Mohs hardness scale, which is hard enough to scratch a glass plate. A yellow bead that fails a glass scratch test is not quartz.

Does citrine fade in sunlight?

Heat-treated citrine may fade when exposed to heat, according to the International Gem Society. Natural untreated citrine holds color better, which is one reason buyers prefer untreated stones.

What inclusions should I see in real citrine?

Natural quartz shows color zoning under magnification, along with growth-related features like two- and three-phase inclusions and negative crystals. A bead with no visible inclusions and perfectly even color deserves closer scrutiny.

Does natural citrine have the same hardness as heated amethyst?

Yes. Both are quartz, both register Mohs 7. The scratch test separates quartz from glass or plastic but does not distinguish natural citrine from heated amethyst.

What is citrine's refractive index?

Citrine measures 1.544–1.553 refractive index, the same range as clear quartz. A refractometer reading in this range confirms the stone is quartz.

Can a jeweler verify whether citrine is natural?

A jeweler can confirm quartz identity through specific gravity testing (2.651) and refractive index measurement (1.544–1.553). Determining whether citrine is natural versus heat-treated requires examining color zoning and growth inclusions under magnification.