Real Quartz vs Glass: Which One Is Actually on Your Wrist?

Your crystal bracelet is real quartz — not glass — if the beads score Mohs 7 on a scratch test and show natural inclusions like color zoning under a loupe. Any bead that fails either check is not quartz, regardless of what the seller listed.

Last updated: September 7, 2026

By Mara Ellison · Founding Editor, Dusk & Relic Journal

Why do so many crystal bracelets turn out to be glass?

The USGS lists glass, plastics, and other materials as substitutes for natural gemstones, noting that simulants are frequently substituted in the market. U.S. net import reliance for gemstones was 99% of apparent consumption every year from 2021 through 2025, per the USGS Mineral Commodity Summaries — nearly every finished bead bracelet sold stateside started overseas, passing through supply chains where substitution goes undetected.

Trust the stone's measurable properties, not the listing. Quartz has specific hardness, density, and inclusion types, all testable at home with a steel surface and a loupe.

Does the scratch test actually work on bracelet beads?

Yes. Clear quartz scores Mohs 7, per the International Gem Society — above steel on the hardness scale. Press one bead firmly against a steel surface and drag: a Mohs-7 bead scratches the steel without picking up a mark. Any bead that gets scratched by steel is softer than Mohs 7 and is not quartz.

The test takes seconds and will not damage a genuine quartz bead. For the exact pressure and angle that produce a clean result, how the scratch and lighter tests compare on rose quartz beads covers both methods.

Citrine and smoky quartz are quartz varieties with identical Mohs 7 hardness and a specific gravity of 2.651. The scratch test works the same way on every quartz-family bead.

What should you see inside a real quartz bead?

Natural quartz contains color zoning (bands of slightly different transparency), two- and three-phase inclusions (tiny pockets of liquid, gas, or both trapped during crystal growth), and negative crystals (void spaces shaped like miniature quartz points), according to the International Gem Society.

Hold the bracelet to a window and inspect bead by bead. Any of these inclusion types is reliable evidence of natural quartz. A completely uniform interior — no zoning, no trapped phases, no voids — warrants running the scratch test before trusting the label. A detailed guide on what genuine clear quartz beads look like up close breaks down each inclusion type.

How do quartz and glass compare on paper?

Property	Natural quartz (IGS data)	What fails this check
Mohs hardness	7	Bead scratched by steel — below Mohs 7
Specific gravity	2.651 (very constant)	Bead feels light for its size
Refractive index	1.544–1.553	Requires a refractometer
Natural inclusions	Color zoning, two-/three-phase, negative crystals	Uniform interior with no visible features

Hardness and specific gravity are the two home checks. Refractive index demands a refractometer most buyers do not own. The inclusion check splits the difference — a loupe costs a few dollars and the inspection takes a minute.

Does this apply to citrine and other quartz types?

Every quartz variety shares the same core numbers. Citrine registers Mohs 7, specific gravity 2.651, and refractive index 1.544–1.553, per the International Gem Society — identical to clear quartz. The scratch test and inclusion check work on citrine, amethyst, smoky quartz, and every other quartz-family bead.

One difference worth knowing: heat-treated citrine may fade when exposed to heat, according to the International Gem Society. A yellow quartz bead that loses color after prolonged sun exposure is still real quartz — just heat-treated. Whether a citrine stone is natural or heat-treated is a separate question from whether the bead is quartz at all.

Which quartz bracelet makes authenticity obvious at a glance?

Choose faceted clear quartz if you want beads that show quartz's identity under any light. Faceting splits the 1.544–1.553 refractive index into visible fire and makes color zoning easy to spot through angled surfaces. First Frost (8 mm, $105) is a faceted clear quartz bracelet where each bead puts those natural markers on display.

Choose rutilated quartz if you want built-in proof. Rutilated quartz is named for the golden rutile needles trapped inside each bead, visible without magnification. Golden Thread (10.5 mm, $115) is a rutilated quartz bracelet where the needles serve as their own authenticity stamp.

I'd pick the rutilated route for anyone who does not own a loupe — the needles answer the question before you ask it.

FAQ

Can I use a kitchen knife for the scratch test?

A standard kitchen knife blade works. Quartz at Mohs 7 scratches the steel blade rather than the other way around. Press firmly and use a small area — a light drag may not leave a visible mark.

Is a completely clear bead with no visible inclusions automatically glass?

Not automatically. Some natural quartz forms with few visible inclusions. The International Gem Society lists color zoning and two- and three-phase inclusions as typical quartz features, but a bead that scratches steel at Mohs 7 is still quartz even without obvious inclusions.

Does the scratch test work on citrine and smoky quartz?

Yes. Citrine and smoky quartz are quartz varieties with Mohs 7 hardness and a specific gravity of 2.651, identical to clear quartz. The same scratch test and inclusion check apply.

Can heat-treated quartz still pass these tests?

Yes. Heat treatment changes color, not hardness or density. Heat-treated citrine scores Mohs 7 and specific gravity 2.651. The only difference the International Gem Society notes is that heat-treated citrine may fade when exposed to heat again.

Do these tests work on a moonstone bracelet?

Moonstone is not quartz and has different properties. Moonstone has a specific gravity of 2.56–2.59, lower than quartz's 2.651, and perfect cleavage in two directions per the International Gem Society, making moonstone more fragile. The Mohs 7 scratch threshold does not apply to moonstone.

Should I test more than one bead on my bracelet?

Test at least two beads on opposite sides. The USGS reports that simulants are frequently substituted for natural gemstones, and one bead passing does not guarantee the rest match.

What does specific gravity 2.651 actually mean?

Quartz at SG 2.651 is 2.651 times denser than water. In hand, a quartz bead feels noticeably heavier than a same-size bead of lighter material. A jeweler's hydrostatic balance can measure SG directly and confirm the stone.