Amethyst is the world's most widely counterfeited crystal. The crystal market has its own version of fakes, and unlike a counterfeit handbag, a dyed fake stone can be almost impossible to spot without knowing what to look for.
This is a practical guide covering the four most common fraud types, and for each one, exactly what to test.
The Four Types of Fake Amethyst
1. Dyed Quartz or Glass
The most common fake. Clear quartz or glass is dyed purple and sold as amethyst. The dye sits in surface cracks rather than forming part of the crystal structure.
How to identify: Look at the stone under strong light. Real amethyst shows colour distributed unevenly, concentrated in zones within the crystal. Dyed material shows colour concentrated along fractures and at the surface. A loupe at 10x magnification makes this visible in under a minute.
2. Synthetic Amethyst
Lab-grown amethyst is chemically identical to natural amethyst but forms under controlled industrial conditions. The result is a stone that is too perfect.
How to identify: Natural amethyst has inclusions, growth patterns, and colour zoning that follow irregular geological processes. Synthetic material tends to show very regular colour distribution and almost no inclusions. If a piece looks flawless at 10x, treat that as a warning sign.
3. Dyed Howlite or Magnesite
Howlite and magnesite are soft white minerals that take dye extremely well. Dyed to purple, they are lightweight, cheap to produce, and frequently sold as amethyst.
How to identify: Hardness test. Real amethyst scores 7 on the Mohs scale and will scratch glass. Howlite and magnesite score 3.5, meaning a steel file will scratch them easily.
4. Heat-Treated Material Sold as Natural Citrine
When amethyst is heated to 470 to 550 degrees Celsius, it turns yellow-orange. Natural citrine is extremely rare. Most commercial citrine is heat-treated amethyst from Brazil or Uruguay. This is not a scam if sold accurately, but be sceptical of unusually cheap and abundant citrine.
The Certificate Question
The most reliable proof of origin is documentation: a certificate identifying the specific mine, extraction date, and a traceable serial number. This is why MEG includes an origin certificate with every piece. If a seller cannot tell you where a stone came from, ask yourself why not.
Bottom line: Buy from sources that document origin. Ask for provenance. Look at the stone under a loupe. The real thing is genuinely extraordinary.