Real or Fake Amethyst (Jamunia): How to Check Before You Buy

Short answer: glass imitations of amethyst can usually be caught at home with a loupe, a sheet of white paper and some patience. Synthetic amethyst cannot. Lab-grown amethyst is the same mineral as natural amethyst, made in a factory, and it is sold in large quantities in Pakistani markets. Only a gem lab can separate the two reliably, so for any stone where the price assumes natural origin, ask for a report or buy from a seller who will arrange testing.

Amethyst (jamunia, sometimes called katela) is purple quartz, 7 on the Mohs scale. It is one of the most affordable natural gemstones, which is exactly why the fakes are so common: a buyer expects a low price and does not ask questions. This guide goes through each kind of imitation, the checks you can do yourself, the treatments you should know about, and how to buy safely. For general care once you own a stone, see keeping amethyst purple.

What you might be offered instead of natural amethyst

Glass: the easiest fake to catch

Purple glass is sold loose, in cheap rings and as "laser cut" stones at bazaar stalls. It has no crystal structure, so it behaves differently from quartz in several ways.

• Bubbles. Under a 10x loupe, glass often shows round or stretched gas bubbles. Natural amethyst never contains round bubbles.
• Swirls. Glass can show curved flow lines, like syrup stirred into water.
• Moulded edges. Cheap glass is pressed in a mould. The facet edges look rounded and soft, and the facet faces may be slightly dished, instead of the sharp, flat facets of a cut stone.
• Warmth. Hold the stone against your lip or the inside of your wrist. Quartz feels cool and stays cool a little longer; glass warms up quickly. This works best when you compare two stones side by side.
• Even, flat colour. Glass is usually the same purple everywhere, with no zoning at all.
• Scuffed facets. Glass is softer than quartz, so a worn glass stone shows nicks and scratches along the facet edges sooner.

Do not test by scratching. A scratch test can damage a real stone, and most buyers do not carry the right reference minerals anyway.

Synthetic amethyst: why it is the real problem

Synthetic amethyst is grown in a pressure vessel from the same ingredients as natural quartz. It has the same hardness, the same refractive index and the same weight. At bazaar prices it is extremely common, and sellers do not always know what they have, because it often arrived mixed in a parcel.

Signs that point towards synthetic, though none of them proves it:

• Perfect clarity at a low price, especially in large stones.
• Perfectly even colour with no zoning, viewed from every direction.
• Many identical stones of the same size, colour and cut, sold in strings or lots.
• Breadcrumb-like specks or a flat "seed" plane inside, which some lab-grown crystals show.

Natural amethyst nearly always has some colour zoning: straight or angular bands, or patches where the purple is stronger near one side. A lab confirms origin by looking at features such as twinning patterns under polarised light and by infrared spectroscopy, which you cannot do at home. For more on how labs separate natural from lab-grown stones, read natural vs synthetic gemstones.

Dyed and coated quartz

Pale or cloudy quartz is sometimes heated to crackle it and then soaked in purple dye. This is common in beads and tumbled stones. Look under a loupe for colour concentrated along the cracks, like ink running into lines, with paler areas in between. A cotton bud dipped in nail polish remover (acetone), rubbed on a hidden spot, sometimes lifts dye; only do this on a stone you own, never on a seller's stock without asking.

Coated quartz has a thin purple film on the back or over the whole stone. Check the girdle and the facet edges, where the coating wears first. Coatings can also show a faint rainbow sheen that natural amethyst does not have.

Other purple stones sold as amethyst, and the reverse

Several purple gems look similar. Some cost far more than amethyst, so the mix-up can go either way.

• Purple sapphire is much harder and much denser. A purple sapphire of the same size feels noticeably heavier in the hand. See our purple sapphire collection to compare.
• Iolite shows strong colour change with direction: violet-blue one way, almost colourless or grey the other. Amethyst changes only slightly.
• Purple fluorite is soft and often shows straight cleavage cracks; it scratches easily.
• Purple spinel is single-coloured from every angle and heavier.

An instrument check with a refractometer and a hydrostatic balance separates all of these quickly, which is why identification is the cheapest kind of lab test.

Five checks you can do at home

1. The white paper check. Lay the stone table-down on white paper under daylight from a window. Natural amethyst usually shows uneven zones of purple when you look through the sides. Perfectly even colour is a reason to look harder.
2. The loupe check. Search for round bubbles and swirls (glass), and for natural features such as feathers, tiny crystals or "tiger stripe" colour bands (natural quartz).
3. The facet edge check. Run the loupe along the edges. Sharp, crisp edges suit quartz; rounded or chipped edges suggest glass.
4. The temperature check. Compare with a quartz you know is real. Glass warms faster.
5. The price check. Ask yourself why a large, flawless, deep-purple stone is so cheap. The answer is usually "synthetic". Compare with the ranges in our gemstone price guide.

These checks catch glass and dye well. They do not prove natural origin. Our wider guide, real or fake gemstones, covers more methods.

Treatments: heated amethyst and colour change

Heating is the main treatment used on amethyst. Gentle heat can lighten a dark, inky stone or remove a brownish tint. Stronger heat turns amethyst yellow or orange, and much of the citrine on the market started as amethyst; see citrine, heated and natural. Some heated material turns green and is sold as "green amethyst" or prasiolite.

Heating is stable and accepted when disclosed. It is not the same as a fake. What matters is that the seller tells you. Some amethyst is also irradiated to deepen colour; that too should be disclosed. GemStore discloses known treatments on every listing.

A related point: natural amethyst can fade in strong, long sunlight. A stone that turned pale on a sunny shop window was still natural; it was simply stored badly.

Amethyst in rings and tasbih: extra checks

Set stones and beads hide some of the clues. In a ring, the back is covered, so look for zoning through the crown and check whether a cheap silver ring holds an unusually large, clean stone. In a tasbih or bracelet, check the drill holes with a loupe: dyed beads often show concentrated colour or a white core around the hole, and glass beads can show tiny conchoidal chips like broken bottle glass at the edges of the hole. Natural amethyst beads usually vary a little in shade from bead to bead. Our gemstone tasbih page explains how bead strings are judged.

What only a lab can tell you

• Whether the stone is natural or lab-grown.
• Whether colour comes from irradiation.
• Whether a "purple sapphire" or "spinel" is really amethyst, or the reverse, if you cannot weigh it accurately.

Lab testing costs money, so for an inexpensive amethyst it may not make sense. For a large stone, an astrological purchase or a gift where natural origin matters, it does. See lab-certified amethyst and how to read a gemstone lab certificate.

Buying amethyst safely in Pakistan

• Ask directly: "Is this natural or lab-grown? Has it been heated or irradiated?" Note the answer, or get it in a WhatsApp message.
• Ask for the weight in carats, then convert with the carat to ratti converter if a seller quotes in ratti. The gem ratti is 0.91 carat.
• Ask for photos and a video in daylight, not under purple or blue shop lights, which make any stone look richer.
• Prefer a return policy long enough to have the stone checked.
• Be wary of "100% original" claims without anything behind them.

Every amethyst in our amethyst collection is natural and photographed individually, for example the 10.35-carat jamunia or the 11.30-carat jamunia. "Laser cut" in our titles describes the faceting style, not the material. A certificate is available on request and independent lab testing can be arranged. Pay cash on delivery anywhere in Pakistan, inspect the stone before paying the rider, and return it within 7 days if you are not satisfied. Questions are welcome on WhatsApp at +92 308 887 3888.

Shop the stones: amethyst.