The 20 Most-Faked Crystals, Ranked

Fake typeDyed howlite, magnesite, or reconstituted powder

An estimated 90% of turquoise on the market is not natural turquoise. Howlite and magnesite take blue dye perfectly and cost cents per pound.

Fake typeMolded green bottle glass

TikTok demand spiked prices 10x post-2020. The only natural source is a 15-million-year-old impact field in the Czech Republic. Glass fakes from China flooded eBay and Etsy.

Fake typeHeat-treated amethyst sold as natural citrine

Natural citrine is rare and pale yellow. The deep-orange clusters sold everywhere are baked amethyst from Brazil. Not toxic, not dangerous, but rarely disclosed.

Fake typeDyed howlite, dyed jasper, or reconstituted

Real Afghan lapis with golden pyrite flecks costs $20-100+ per polished piece. Dyed substitutes sell for a dollar.

Fake typeReconstituted powder in resin, or pure plastic

Real malachite's concentric banding is hard to fake perfectly. Cheap composites press ground malachite into resin and call it real.

Fake typeGlass, dyed quartz, or hydrothermally grown synthetic

The most popular crystal in the world. Cheap glass imitations are everywhere; lab-grown synthetic amethyst is harder to distinguish without instruments.

Fake typeDoublets, triplets, and Slocum stone glass imitations

Genuine play-of-color opal costs $50-50,000+ per carat. Composites (real opal slice glued to dark backing) and Slocum stone (glass with foil inclusions) flood the low end.

Fake typeDyed quartzite, glass, or B/C-grade treated jadeite

Jade has been the most valuable mineral in Chinese culture for 5,000 years. Real imperial jadeite reaches millions per piece; counterfeits are routine.

Fake typeDyed quartz, blue glass, or resin

The only natural source is one mine in the Dominican Republic. The sky-blue color with white veining is easy to imitate with dye.

Fake typeDyed clear quartz or pink glass

Cheap and popular. Dyed clear quartz looks brighter and more uniform than real rose quartz, which fools buyers expecting saturated color.

Fake typeSynthetic Verneuil corundum or lead-glass-filled composite

Natural untreated ruby is one of the rarest gems. Flame-fusion synthetics are chemically identical and cost 1% of natural. Lead-glass-filled rubies are sold as natural and disintegrate over time.

Fake typeSynthetic hydrothermal beryl or oil-filled cracks

Virtually all emeralds on the market are cedar-oil filled to hide cracks. Undisclosed oil treatment makes a flawed stone look gem-grade. Synthetic emeralds are also widespread.

Fake typeSynthetic Verneuil corundum and heat-treated geuda

Same problem as ruby: chemically identical synthetics are indistinguishable to the naked eye and cost a fraction. Beryllium-diffusion-treated sapphires are also routinely sold as natural.

Fake typeBlue glass, blue topaz, or blue spinel

Aquamarine commands gem-tier prices. Cheaper blue topaz, blue glass, and synthetic spinel are routinely misrepresented as aquamarine in low-trust markets.

Fake typeHeat-treated zoisite (universal, often undisclosed) or synthetic spinel

Almost all tanzanite is heat-treated from brown zoisite to enhance the blue-purple color. The treatment is accepted in the trade, but synthetic spinel imitations and untreated misrepresentation are common.

Fake typeSynthetic Czochralski-grown chrysoberyl, or color-change garnet

Natural alexandrite is one of the rarest gems on Earth. The vast majority of stones sold as 'alexandrite' are synthetic Czochralski or Verneuil. Color-change garnets are also sold as alexandrite.

Fake typeDyed magnesite or dyed howlite

Real sugilite from the Wessels mine in South Africa is increasingly scarce and expensive. Dyed magnesite passes visually but is much softer.

Fake typePlastic or resin composites with purple dye

Real charoite has a distinctive swirling fibrous structure only found in one location in Siberia. Plastic imitations attempt the swirl but feel and behave wrong.

Fake typeSynthetic flame-fusion or heat-treated/irradiated tourmaline

Synthetic tourmaline is uncommon, but irradiation to deepen color is routine and often undisclosed. Glass and pink topaz imitations also appear at the low end.

Fake typeHeat-treated or dyed agate sold as natural carnelian

Most 'carnelian' on the market is heat-treated agate. The treatment is acceptable and stable, but undisclosed dye treatments produce uneven color that fades.