Rock Discoveries

Ametrine: How to Identify Real vs Fake Stones

Ametrine: A Guide to Identifying Real vs. Fake

Ametrine is a rare bi-colored gemstone that combines purple and yellow hues found within a single crystal of quartz.

Its unique appearance makes it an attractive choice for jewelry and personal adornment. However, as with any valuable gemstone, there are often simulated, synthetic, or treated stones sold as genuine.

In this guide, we will provide you with valuable insights on how to identify real ametrine and help you avoid purchasing fake ones.


The Anahi mine in Bolivia is widely recognized as the primary source of genuine ametrine. The mine has a reputation for producing high-quality crystals with excellent color saturation and clarity.

Ametrine crystals originating from the Anahi mine are also notable for their distinct color zoning patterns, which are a result of the temperature fluctuations that occur underground. If you are unsure about the origin of the ametrine, it is best to ask your supplier for certification that authenticates the origin of the stone.

If the supplier is unable to provide certification, you should be cautious about purchasing the stone.


Genuine ametrine stones can be expensive due to their rarity and the difficulty in mining them. If you come across a cheap ametrine stone that appears too good to be true, it probably is.

Synthetic and treated ametrine stones are more readily available and hence easier on the pocket. It is essential to check if the supplier has disclosed any information about this treatment or their synthetic origin.

Yellow and Purple Colors

Ametrine’s primary colors are yellow and purple. The color saturation of the stone plays an important role in determining its quality.

A genuine ametrine crystal will typically have a bright, saturated yellow and purple hue that is evenly distributed throughout the crystal. However, in some cases, the stone’s colors can be modified to increase its value.

Sometimes, color-enhanced yellow quartz is combined with natural amethyst to create the bi-color effect. This treatment is not considered fraudulent but is usually disclosed by suppliers for transparency.

Comparing C-axis to Color Boundaries

The internal structure of a genuine ametrine crystal can be observed using a polariscope. In a genuine ametrine crystal, the C-axis of the yellow and purple color zones will follow the crystal’s optical axis.

This unique internal structure is known as the birefringence effect, which is caused by the two-colored zones’ different optical properties. Maintaining a keen eye and having gemological training improves the probability of differentiating between a synthetic and natural stone as the synthetic ones would show uniform color distribution.

Take it to a Gemologist

We highly recommend taking your ametrine stone to a certified gemologist for identification. Gemologists can appraise and certify if a stone is indeed genuine and originate from a specific location.

Gemological equipment for identifying authentic ametrine, such as polariscopes, refractometers, and gemological lighting, is relatively expensive and requires training to use expertly. Professionals have access to all the equipment and knowledge required to identify genuine ametrine accurately.

In conclusion, identifying genuine ametrine requires careful attention to detail and thorough knowledge of the stone’s unique properties. Your best bet is to source from reputable dealers who can supply certification and be transparent about the stone’s origin and treatment.

Alternatively, take your stone to be appraised by a certified gemologist to avoid purchasing a synthetic or treated stone. With these tips in mind, you can confidently add a genuine ametrine to your collection.

In conclusion, when purchasing ametrine, it is crucial to know its provenance, pricing, and color properties, and to seek a certified gemologist’s help if needed. Avoiding synthetic or treated stones and purchasing from reputable dealers is key to adding a genuine ametrine to your collection.

For more information, here are some frequently asked questions answered concisely and accurately:


1. What is ametrine?

Ametrine is a rare bi-colored gemstone that combines purple and yellow hues found within a single crystal of quartz. 2.

Where does ametrine come from? The Anahi mine in Bolivia is widely recognized as the primary source of genuine ametrine.

3. How can I tell if ametrine is real or fake?

You can look at provenance, pricing, colors, and take it to a gemologist for certification. 4.

Is it okay to buy treated or synthetic ametrine? It depends on your preference and budget.

Just make sure that the treatment or synthetic origin is disclosed and you are purchasing from a reputable dealer. 5.

Why is ametrine so expensive? Ametrine is rare and difficult to mine.

Genuine ametrine stones with excellent color saturation and clarity come from the Anahi mine, making it more expensive.

Popular Posts