Is Your Crystal Real? 5 Simple Ways to Test at Home

There is nothing worse than buying a stunning piece of "Amethyst" or "Turquoise" only to discover weeks later that it’s just dyed plastic or glass.

At Million Years Crystal, we source our minerals directly from mines in Brazil, Uruguay, and beyond. We’ve seen it all—from stunning museum-grade specimens to convincing counterfeits. As crystal healing and collecting grow in popularity, unfortunately, so do the fakes.

You don't need a gemology degree to spot the obvious dupes. Here is our expert guide on how to tell if your crystal is real using simple tests you can do at home.

1. The Temperature Test (Cold to the Touch)

This is the easiest, non-destructive test you can do in seconds.

Real crystals possess high thermal inertia. This means they feel cold to the touch, even in a warm room, and they take a long time to warm up when held in your hand.

The Test:

1. Pick up the crystal. Does it feel instantly cool, like an ice cube that’s been sitting out for a minute? That’s a good sign.

2. Hold it for 10 seconds.     

3. Real Stone: Will stay cool for a few seconds before slowly absorbing your body heat.

4. Glass or Plastic: Will warm up to your body temperature almost immediately.

Note: This works best for Quartz variants (Amethyst, Rose Quartz, Citrine).

2. The Bubble Check (Visual Inspection)

Nature is messy; factories are perfect. This rule is key to identifying glass fakes.

The Test: Hold your crystal up to a light source or use a magnifying glass.

• Look for Air Bubbles: If you see tiny, perfectly round air bubbles inside the stone, it is almost certainly glass. Real crystals form under immense pressure underground where air bubbles cannot exist.

• Look for Inclusions: Real crystals often have flaws, fractures, or clouds inside. These are called inclusions. Think of them as "nature's fingerprints." If a crystal looks too perfect, be suspicious.

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Pro Tip: Genuine Quartz is rarely 100% optically clear unless it is incredibly expensive. If you bought a "perfect" clear quartz ball for £10, it is likely glass.

3. The Hardness Test (The Scratch Test)

In geology, we use the Mohs Hardness Scale to rank minerals from 1 (softest, like Talc) to 10 (hardest, like Diamond). Glass usually ranks around 5.5 on this scale.

The Test (Proceed with Caution):

• The Glass Test: Most genuine crystals (like Quartz, Amethyst, and Agate) are harder than glass. If you take your crystal and firmly scratch a piece of scrap glass (like a glass bottle), a real crystal should leave a scratch on the glass.

• The Steel Test: If you can scratch the crystal easily with a steel knife or a pin, it might be a soft fake (like plastic) or a very soft mineral like Calcite or Selenite.

Warning: Do not perform this test on soft stones like Selenite, Fluorite, or Calcite, as you will damage them!

4. The Weight Test

Real stones are dense and heavy. Fakes made of plastic or polymer resin are surprisingly light.

The Test: Compare the stone to a generic rock from your garden of a similar size.

• If your "crystal" feels significantly lighter than a regular rock, it is likely plastic.

• Real minerals should have a satisfying "heaviness" to them.

5. Spotting "Dyed" vs. Natural Stones

Some stones are real minerals, but they have been chemically dyed to look more expensive. While the stone itself is real, the color is fake.

Common Offenders:

• Neon Colors: Nature rarely produces neon pinks, electric blues, or highlighter greens. If an Agate slice looks shockingly bright, it is likely dyed.

• Color Concentration: Look at the cracks and fractures in the stone. If the color looks darker and more concentrated inside the cracks, it means dye has pooled there. Natural color is usually consistent throughout the stone structure.

Summary: Trusted Sources Matter

The crystal market is vast, and navigating it can be tricky. While these home tests are great for filtering out bad fakes, the only way to be 100% sure is to buy from reputable sellers who are transparent about their sourcing.

At Million Years Crystal, we pride ourselves on honesty. Whether it’s a raw cluster or a polished point, we guarantee the authenticity of every piece we ship from our UK warehouse.

Ready to start your collection with confidence? [Browse our Authentic Crystal Collection Here]