The vocabulary of crystal selling is loose, and that looseness costs buyers money. This guide defines each term precisely and explains what to ask before you buy.
Natural
Natural means the material formed in the earth rather than being manufactured. It says nothing about treatment. A natural stone can be natural and dyed, or natural and heat-treated. "Natural" is the beginning of the description, not the end of it.
Genuine
Genuine means the stone really is the material it is sold as. A genuine amethyst is amethyst; a genuine turquoise is turquoise. It is a statement about identity, not about treatment or origin. An imitation turquoise (dyed howlite, for instance) is not genuine turquoise even though it may look similar.
Untreated
Untreated means nothing was done after mining to change the stone's colour or clarity. Untreated material is less common and usually more expensive, because impurities and pale colour cannot be "fixed". A seller who claims untreated for cheap, vividly coloured material is usually mistaken or misleading.
Heat treatment
Controlled heating changes colour by altering trace elements inside the crystal. Citrine is the classic example: heating amethyst or smoky quartz produces golden citrine, and most citrine on the market was heat-treated. Heat treatment is stable, permanent, and widely accepted. The stone is still genuine citrine — heat is simply part of how that colour arises in the trade.
Dyeing
Dye is introduced into porous or fractured material to intensify or change colour. Dyed agate, dyed quartz and "turquoise" howlite are common. Signs include colour pooling in cracks and drill holes, colour that looks flat across every bead, and colour that comes away on a damp cloth. Dyed stone is not fake stone — but it should be disclosed.
Irradiation
Controlled irradiation is used to deepen or shift colour, for example in some smoky quartz and blue topaz. It mimics natural radiation processes, and the result is generally stable. As with heat treatment, disclosure is the issue, not the technique.
Stabilisation, waxing and resin
Porous or friable material may be impregnated with resin or wax, or surface-sealed, to hold it together and take a polish. This is common with turquoise and some soft stones. The treatment improves durability, but heavily stabilised material is partly resin by weight and should be priced accordingly.
Synthetic / lab-grown
Synthetic (lab-grown) material has the same chemical composition and crystal structure as the natural stone, but was grown in a laboratory. Lab-grown quartz and lab-grown ruby are real quartz and real corundum — just not mined. Chemically and structurally they can be excellent; commercially they should cost far less than natural equivalents, and they should be labelled as synthetic.
Imitation / faux
Imitation material is not the stone at all. It might be glass, resin, ceramic or dyed howlite standing in for turquoise or lapis. Imitation is legitimate when it is sold as imitation and deceptive when it is not.
Are treated crystals always bad?
No — and the framing is misleading. Treatment is a normal, established part of the gem trade. Without heat treatment, affordable citrine would barely exist; without stabilisation, much turquoise would crumble. A treated stone can be beautiful, durable and honestly priced.
The genuine problems are, in order:
- Undisclosed treatment sold at untreated prices.
- Imitation sold as a natural species.
- Synthetic sold as mined natural material.
Ask directly: "Is this natural, and has it been treated? If so, how?" A seller who knows their stock will answer. A seller who will not answer has told you something useful too.
Why do natural crystals vary?
Because they grew under conditions that were never identical twice. Temperature, pressure, chemistry and cooling rate all vary, and those variations are recorded permanently in colour zoning, inclusions and internal fractures. No two pieces of natural material are identical — which is exactly why identical-looking mass-produced strands deserve a second look.
Why can natural crystals have inclusions?
Inclusions are other minerals, gas bubbles, liquids or fractures trapped during growth. Far from being flaws in every case, they are diagnostic: rutile needles in quartz, pyrite in lapis, tourmaline rods in quartz. Some inclusions reduce value when clarity is the point; others, like rutilated quartz, are the entire reason the stone is prized.
Vincryst's position
We sell natural crystal jewellery. Where a stone is commonly treated in the trade — most obviously citrine — we treat that as normal and describe the stone by species. Where we can identify treatment, we disclose it. Where we cannot verify a claim, we do not make it. Sourcing regions for our stones are Brazil, India, Madagascar and Inner Mongolia, and they vary by stone and collection.
Questions about a specific piece? Contact us and ask before you order.
Frequently asked questions
What does natural crystal mean?
That the material formed in the earth rather than being manufactured. It does not mean the stone is untreated — a natural crystal can also be dyed or heat-treated, and that should be disclosed separately.
What does genuine mean in crystal jewellery?
That the stone really is the material it is described as. Genuine refers to identity, not treatment or origin. Dyed howlite sold as turquoise is not genuine turquoise.
What does untreated mean?
That nothing was done after mining to change the stone's colour or clarity. Untreated material is rarer and usually more expensive, because pale colour and inclusions cannot be corrected.
What is heat-treated crystal?
Crystal that has been heated in a controlled way to change its colour. Most citrine is heat-treated amethyst or smoky quartz. The treatment is permanent and the stone remains genuine citrine.
Are treated crystals worth buying?
Often yes. Treatment makes colour and durability available at accessible prices. The issue is disclosure, not treatment itself. Buy treated stones when the seller states the treatment honestly.
What is the difference between synthetic and imitation crystal?
Synthetic (lab-grown) material has the same chemistry and structure as the natural stone but was grown in a lab. Imitation is not that stone at all — it is glass, resin or another mineral standing in for it.
Why are natural crystals never identical?
Because each formed under different temperature, pressure and chemistry, and those conditions are recorded in colour zoning and inclusions. That natural variation is a strong argument for authenticity.