About this stone
Color
GoldBrassMetallic
Origin
PeruSpainItalyChinaRussia
Mohs hardness
6–6.5
Treatment categories
Natural
Industry-standard treatment
Natural — pyrite is not typically treated
Mineral chemistry
Iron sulfide (FeS2)
Crystal system
Cubic
Stone family
Sulfide
Common cuts
CubeRoundFaceted Round
Common sizes
3mm4mm6mm8mm
Care notes
Moderate-hard (Mohs 6–6.5) but reactive — can oxidize/rust in humid conditions. Store dry; mild soap and soft cloth; avoid moisture.
Related stones
Marcasite, Hematite, Chalcopyrite
Frequently asked questions
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Is pyrite real gold?
No — pyrite is iron sulfide (FeS₂), not gold. The metallic brassy luster and gold-like color earned it the historical nickname "fool's gold." Pyrite is a distinct mineral with its own properties: Mohs 6–6.5 (gold is Mohs 2.5–3), isometric cubic crystal habit (gold doesn't typically form cubes), and significantly higher hardness than gold. Designers buy pyrite for the natural metallic tone — gold color from the mineral itself, not from plating or coating. -
Does pyrite tarnish?
It can. Pyrite is iron sulfide; prolonged exposure to humidity and oxygen can oxidize the surface, dulling the brassy luster. In extreme cases — long-term storage in damp conditions — the surface can develop a greenish-white powdery efflorescence. Most jewelry-grade polished pyrite beads carry a thin protective sealant from the cutter that slows this. Standard care: store dry, wipe with a soft dry cloth after wear, avoid ultrasonic and steam cleaning, and avoid sulfur-rich environments (hot tubs, sulfide springs). -
How durable is pyrite for daily wear?
Mohs 6–6.5 — durable enough for most jewelry applications including necklaces, bracelets, and earrings. Pyrite is somewhat brittle compared to quartz-family stones at the same hardness rating, so it can fracture under sharp impact; treat with reasonable care in ring applications. The bigger concern for daily wear is surface oxidation rather than mechanical wear — the care practices above protect the luster more than the structure. -
Why is pyrite cut into cubes?
Pyrite's natural crystal habit is isometric cubic — the mineral grows in nature as right-angled cubes with flat faces and sharp edges. Cube-cut pyrite beads lean into that natural geometry rather than smoothing it away. The cubic cut is one of the few bead shapes that reflects an actual property of the rough rather than imposing a generic bead form on it. Round-cut and faceted-cut pyrite are also widely available for designs that want the metallic register without the cubic edge. -
Where does pyrite come from?
Pyrite is sourced from many deposits worldwide. Major producers include Peru (well-known for sharp cubic crystals), Spain (Navajún in La Rioja produces the cleanest cubic specimens in the world), China, Russia, and the United States. Most bead-trade pyrite is from large industrial-scale deposits rather than specimen-grade mines, and origin is not typically called out as a quality differentiator — the material's character is consistent enough across sources that origin matters less than cut, size, and surface finish. Where origin is known — ask before buying if it isn't specified.