Recognising Real Citrine: Natural, Heated or Fake?
Most citrine on the market is heated amethyst. Colour signs, clues in clusters, misleading names and simple, safe tests.
Key points
| Nature | yellow to orange quartz (SiO2), colour caused by traces of iron |
|---|---|
| Hardness (Mohs) | 7 |
| Density | about 2.65 |
| Most often | heated amethyst or smoky quartz, a widespread and long-standing treatment |
| Natural citrine | rare; pale yellow to honey yellow, sometimes slightly smoky |
| Imitations | yellow glass, dyed quartz, other yellow stones (topaz, beryl, sapphire) |
| Misleading names | "Madeira topaz", "Spanish topaz", "golden topaz" |
| If the piece is valuable | certificate from a gemmological laboratory |
What is called “citrine”
Citrine is a transparent quartz, ranging from pale yellow to brownish orange. It shares the hardness (7) and the composition of amethyst and rock crystal. According to the GIA, natural citrine is uncommon: most of the citrine sold comes from heating amethyst, which changes from violet to yellow, orange or brownish orange. Smoky quartz can also be heated or irradiated to give lemon-yellow and green shades ("lemon quartz").
This heating is old and common. It does not make the stone a fake: it is real quartz. The problem arises when it is called "natural citrine" although it has been heated. French regulations require that significant treatments be disclosed (see real or fake stone).
Heated citrine is therefore the textbook example of a stone that is "real" but "treated": both words are correct at once. Natural citrine does exist, notably in Brazil, Madagascar and Spain, but in small quantities.
Natural or heated: the clues
An experienced eye or a gemmologist does not rely on a single clue. Here are the ones most often cited. They are indicative.
| Clue | More likely natural | More likely heated |
|---|---|---|
| Colour | Pale yellow to honey yellow, sometimes slightly smoky; not very saturated | Vivid orange, reddish orange or brownish red (the "Madeira" shade) |
| Colour distribution | Fairly even or slightly uneven | Deeper colour at the tips, base almost white or colourless in clusters and geodes |
| Appearance of the points | Crystals with diffuse colour along their whole length | Dark points and clusters with a milky base, typical of an amethyst geode |
| Cracks | Rare | Small internal fissures sometimes visible after heating |
| Price | Higher | Common and affordable |
These markers have exceptions, and some natural Brazilian citrines are darker than people think. Dichroism (a natural stone shows two shades depending on the angle; a heated one shows almost none) can only be checked with laboratory equipment.
Real fakes: glass, dyed quartz and other yellow stones
- Yellow glass: round bubbles under the magnifier and no natural flaws; it feels less cold than quartz at first contact.
- Dyed quartz: colourless, fractured quartz that has been dyed; the colour settles in the fissures.
- Other yellow stones: yellow topaz, beryl, yellow sapphire. They exist, but they are rarer and more expensive.
- Synthetic citrine: yellow quartz can be grown in a laboratory. It is identical in composition and must be declared as synthetic.
The names "Madeira topaz", "Spanish topaz", "golden topaz" or "Brazilian topaz" applied to citrine are misleading: topaz is a different mineral. Professionals advise against these terms.
Simple, safe tests
- Read the description: "natural citrine", "heated citrine", "treated quartz". If nothing is said, ask.
- Look under the magnifier: round bubbles indicate glass; coloured fissures indicate dyed quartz; irregular inclusions or small veils are natural.
- Look at the points of a cluster: a white base and very orange tips suggest a heated amethyst geode.
- Test the temperature by touch: quartz feels cooler than glass at first contact, then warms more slowly. Indicative only.
- Compare in daylight and under warm light: an orange shade that is too uniform and too strong is suspicious.
- Avoid prolonged direct light if you want to keep a citrine: some yellow and brown shades fade.
Do not scratch the stone to test it: quartz is hard to scratch and the test does not distinguish natural from heated citrine. Also avoid flames and chemical products.
What these clues do not prove
No home test can prove whether a citrine has been heated or not. The differences between natural and heated citrine are subtle, and a gemmological laboratory relies on several instruments. For a large cut stone, a collector's piece or a valuable piece of jewellery, ask for a certificate.
For decoration, a cluster or a tumbled stone, the question is different: a beautiful heated citrine, honestly described, is a very fine stone. Our product pages state the nature and known treatments: see our commitments.
Frequently asked questions
Is commercial citrine natural?
Most often, not in the strict sense: it is amethyst or smoky quartz that has been heated. It is real quartz, but treated. Natural citrine is rarer, paler and more expensive.
How can I recognise a heated citrine?
A vivid orange or reddish shade, dark points on a white base (in clusters) and a low price suggest heated amethyst. These are only clues: only a laboratory can be certain.
Is heated citrine inferior?
It is no softer and no less beautiful: its hardness is 7, like natural citrine. It is simply treated, and it must be declared as such.
Can citrine fade?
Some citrines, natural or heated, may lose a little colour after long exposure to strong light or heat. Store them away from direct sun.
Why is citrine called "Madeira topaz"?
It is an old jewellery name dating from the time when yellow stones were confused with one another. It is misleading: topaz is a different mineral. It is avoided today.
Also read
The meanings mentioned belong to tradition and symbolism. They are neither promises of results nor medical advice. Back to Recognising real stones.