Is Fire Quartz Natural? Real vs Fake Hematoid Quartz Explained

Hematoid quartz is quartz, SiO₂, Mohs 7, carrying fine particles of iron oxides and iron oxyhydroxides. The Quartz Page notes that red inclusions sold as lepidocrocite have turned out to be hematite whenever they were analysed, and that limonite is a mixture of hydrated iron oxides, mostly goethite. Hematite is red. Goethite is yellow to brown. A single bead can hold both in separate zones.

The doubt in the market comes from three other objects that share the shelf. Pale quartz or quartzite can be cracked and soaked in red dye. Glass can be melted with red particles stirred in and sold as cherry quartz or strawberry quartz. Natural material carrying yellow-brown goethite can be heated until the goethite turns into red hematite.

Is fire quartz natural, heated, dyed or glass?

Natural, when the bead is what the name says. Fire quartz and hematoid quartz are overlapping names for iron-included quartz, a naming story told in Fire Quartz vs Hematoid Quartz, and the mineral facts sit in the hematoid quartz guide. On a listing the same two words can cover four objects, so the first step is to work out which one is being described.

• Untreated iron-included quartz. Red or orange particles enclosed in the crystal during or after its growth, often as clouds, plates or flat iron-oxide films along fractures, with colour that shifts from bead to bead along a strand.
• Heated iron-included quartz. The same natural material, warmed until yellow-brown goethite loses its water and becomes red hematite. The quartz and the iron are both still natural; the colour of the iron changed in a kiln.
• Dyed quartz or quartzite. Pale material cracked by heating, then soaked in red dye that settles in the cracks and pores. GIA lists quartz among the materials dyed in this way.
• Manufactured glass. Melted glass with red particles or swirls added, traded as cherry quartz, strawberry quartz or red quartz. Those three names have their own page: Cherry, Berry and Strawberry Quartz: Glass or Stone?

Bead strings can also contain a fifth object, a composite of dyed stone fragments held together in resin. A laboratory separates that one with Raman spectroscopy and elemental analysis; a loupe usually catches the resin at the drill hole first.

Where does the red sit in the bead?

In one of three places: inside the quartz, along the cracks, or stirred through the whole bead. Each place points to a different object, and a 10x loupe is enough to see which. Hold the bead against a white card under daylight or a neutral lamp. Iron oxide that entered the crystal as it grew shows up as clouds, dust, plates or flat phantom layers that stop at an internal boundary. GIA describes a second natural route as well: iron-rich groundwater invades surface-reaching features such as sealed fractures and growth tubes, dries out, and leaves solid iron deposits inside them. Colour that follows a crack is therefore compatible with a natural stone. Iron-Stained vs Iron-Included Quartz walks through the three positions colour can occupy.

Dye behaves differently. Gem-A's guidance on dyed gemstones notes that dye concentrates in pore spaces and fractures, and that in most cases this distribution confirms dyeing. On a drilled bead the hole is the giveaway. A dyed bead is darkest at the rim of the hole and in every surface pit, because the dye entered from outside. Gem-A adds a caution: yellow-brown to red-brown colour in fractures can also come from natural weathering at the Earth's surface, so one stained crack should be read together with the rest of the bead.

Glass shows a third pattern. The red is stirred through the whole bead as swirls or scattered evenly as flecks, and a round gas bubble often sits in clear glass with nothing around it. Geology.com's note on imitation strawberry quartz shows exactly this: glass beads with red particles and trapped gas bubbles. Quartz can hold rounded bubbles too, inside tiny fluid pockets. One bubble means check the rest of the strand; a bubble in every bead means glass.

Does heating make fire quartz fake?

No. Heating changes the colour of the iron inside the bead, and the quartz and the iron are still natural. GIA's John Koivula showed the mechanism on sapphire. Goethite in sealed fractures, heated in air to only 350 °C, gave up its water and converted to hematite, and the deposit went from brownish yellow to a rusty brownish red. He notes that a change at such a low temperature can occur in almost any gem material during routine heating, and gives amethyst turning to citrine as an example. Yellow-brown iron-included quartz put through the same heating comes out red.

A strand where every bead is the same rusty red therefore invites one question the seller should be able to answer: was the lot heated? A heated bead has no dye in its cracks and no bubbles. It passes every screen in the table above. Whether its hematite formed red in the ground or turned red in a kiln is a harder question, and a routine bead report seldom addresses it. If the listing says nothing about heating, ask. The Crystal Treatment Chart lists which stones are routinely heated, and under the Crystal 4T™ grading system dyed, coated or filled material does not enter BE. at all, while heated material enters only when the heating is stated on the Stone Origin Record and on the product page.

Which home tests should you skip, and what does a laboratory do instead?

Skip scratching, acid, the hot needle and the flame; a laboratory gets its answer from light instead. Quartz sits at Mohs 7 and hematite at 5.5 to 6.5, so a scratch on a bead only shows that the surface is hard, and the scratch stays. Acid attacks iron oxide on the surface and can lighten a natural stain as readily as a dye. A hot needle melts resin, cracks glass and burns thread. Gem-A mentions an acetone swab for dye, then adds that some dyes are insoluble and others sit under wax or resin; on a strung bracelet the solvent also reaches thread, glue and clasp, so leave it for a loose bead.

A gemmological laboratory starts with the microscope and the same positional logic as the loupe, then adds instruments. Raman spectroscopy reads how the host scatters laser light: quartz gives sharp, distinct peaks, while glass, which has no crystal lattice, gives broad bands. Raman also identifies the red particles themselves, hematite against goethite, and picks up foreign material introduced by treatment. FTIR separates manufactured glass from natural glass and helps distinguish natural quartz from laboratory-grown quartz. Elemental analysis flags metal flakes and dye chemistry that no iron oxide would carry.

When does that spend make sense? For one bracelet at ordinary bead prices, rarely. For a lot bought for resale, for a strand whose price rests on the word untreated, or for any bead where the loupe screen and the listing disagree, a report that names the host mineral and the inclusion mineral settles it. The general framework for other materials is in Real vs Fake Crystals, and the colourless host has its own page, Real vs Fake Clear Quartz.

What should you ask before buying hematoid quartz beads?

Ask four things: the material name, the treatment status, where the red sits, and what happens if a test disagrees with the listing. The table gives the answer that fits natural iron-included quartz and the answer that should end the conversation.

On a BE. strand the first two answers are printed on the product page and the Stone Origin Record, and the hematoid strands sit in The Prism collection.

1. Akhavan, A., The Quartz Page: Inclusions (hematite, goethite and limonite in quartz; red inclusions called lepidocrocite identified as hematite)
2. Koivula, J.I., Gems & Gemology, Fall 2013: Useful Visual Clue Indicating Corundum Heat Treatment (goethite to hematite at 350 °C)
3. GIA: An Introduction to Gem Treatments (dyeing, coating, fracture filling)
4. Gem-A: How to Recognise Dyed Gemstones and What to Look Out For
5. Gems & Gemology, Winter 2024: Raman Spectroscopy and X-Ray Diffraction
6. Gems & Gemology, Winter 2024: Infrared Spectroscopy and Its Use in Gemology
7. GIA: An Introduction to Imitation Diamonds & Other Gems
8. GIA: Amethyst (quartz, SiO₂, Mohs 7)
9. Geology.com: Strawberry Quartz, including imitation glass beads
10. Wikipedia: Hematite (Fe₂O₃, Mohs 5.5 to 6.5)
11. Wikipedia: Goethite (FeO(OH))
12. Gübelin, E.J. and Koivula, J.I. Photoatlas of Inclusions in Gemstones, Vol. 2. Opinio Verlag, 2005.
13. O'Donoghue, M. (ed.) Gems, 6th edition. Butterworth-Heinemann, 2006.