How to Tell If Alexandrite Is Real or Fake: A Comprehensive Guide

How to Tell if Alexandrite is Real or Fake: A Comprehensive Guide – Are you considering purchasing an Alexandrite gemstone?

Known for its mesmerizing color-changing properties, Alexandrite is a highly sought-after and valuable gemstone. However, due to its rarity and high value, it has also become a target for counterfeiters.

In this article, we will guide you through the process of how to tell if Alexandrite is real or fake. By following these expert tips and techniques, you can confidently identify genuine Alexandrite and avoid being deceived by imitations.

Understanding Alexandrite’s Unique Characteristics

Alexandrite is a captivating gemstone renowned for its remarkable color-changing abilities. This rare variety of the mineral chrysoberyl displays a vivid green or bluish-green hue in daylight but transforms into a stunning red or purplish-red shade under incandescent lighting.

This striking color shift, known as the Alexandrite effect, is caused by the presence of chromium and its ability to absorb certain wavelengths of light.

How to Tell If Alexandrite Is Real or Fake

In general, there are several ways to tell if Alexandrite is real or fake:

1. Conducting a Visual Examination

One of the initial steps in how to tell if Alexandrite is real or fake is to carefully examine color and color change properties.

Genuine Alexandrite exhibits a distinct and noticeable change in color under different light sources. It is essential to view the gemstone under both natural daylight and incandescent lighting to observe the color transformation. A genuine Alexandrite will display a clear and dramatic shift from green to red.

2. Assessing Alexandrite’s Clarity and Transparency

Apart from color, the gemstone’s clarity and transparency are essential factors to consider. Real Alexandrite typically possesses excellent transparency, allowing light to pass through with minimal obstructions. It should be free from visible inclusions, cracks, or cloudiness.

However, it’s important to note that some natural Alexandrite may contain minor inclusions, which are acceptable as long as they don’t significantly impact the gemstone’s overall beauty and durability.

3. Evaluating Alexandrite’s Optical Properties

Pleochroism refers to the property of certain gemstones to exhibit different colors when viewed from different angles. Alexandrite is strongly pleochroic, showing green, red, and sometimes even orange or purple hues when observed from different directions.

To test this characteristic, rotate the gemstone between your fingers and observe the colors that manifest. Genuine Alexandrite will demonstrate pronounced pleochroism, while fake stones may exhibit uniform color throughout.

4. Employing a Polarizing Filter

Another useful tool in determining the authenticity of an Alexandrite is a polarizing filter. This filter helps identify the gemstone’s birefringence, which is the extent to which light is split into two rays as it passes through the stone.

By placing the filter over the Alexandrite and rotating it, you can observe the gemstone’s birefringence effect, which is a telltale sign of its authenticity.

5. Seeking Professional Gemological Testing

If you’re still uncertain about the authenticity of an Alexandrite, it is highly recommended to seek the assistance of a certified gemologist.

These professionals possess the expertise and specialized equipment to conduct thorough examinations, including advanced spectroscopy and magnification techniques.

A gemologist can provide you with an accurate assessment of the gemstone’s authenticity and valuable insights into its quality

Additional Tips for Authenticity Verification

UV Testing

Another technique that can be used to determine the authenticity of Alexandrite is UV testing. Genuine Alexandrite will exhibit a characteristic fluorescence under UV light.

Use a UV light source and observe the gemstone’s reaction. If it shows a distinct color change or glows under UV light, it is more likely to be genuine.

However, keep in mind that UV testing alone is not conclusive evidence and should be used in conjunction with other methods.

Heat and Refractive Index Testing

Heat testing and refractive index measurement are advanced methods that can be performed by professionals to confirm Alexandrite’s authenticity.

Heating the gemstone can reveal any treatments or enhancements, as natural Alexandrite is typically stable under moderate heat.

Refractive index testing involves measuring the gemstone’s ability to bend light, which can provide valuable information about its authenticity.

Avoiding Common Pitfalls and Red Flags

If a seller offers an Alexandrite gemstone at an unusually low price, exercise caution. Genuine Alexandrite is a rare and valuable gemstone, so significant discounts may indicate a fake or treated stone.

Research the market value of Alexandrite and compare prices from reputable sources to ensure you are making an informed purchase.

Lack of Authenticity Documentation

Always request and verify any authenticity documentation accompanying the Alexandrite gemstone.

Reputable sellers will provide certifications from recognized gemological laboratories, such as the Gemological Institute of America (GIA) or the American Gemological Laboratories (AGL). These certificates provide crucial information about the gemstone’s origin, authenticity, and any treatments it may have undergone.

Related: Alexandrite vs Amethyst: Which One is Right for You?


Summarize the key points discussed in the article and reiterate the importance of following the provided methods how to tell if Alexandrite is real or fake. Emphasize the significance of seeking professional assistance when in doubt and the need for careful consideration before making a purchase.

Remember, purchasing an Alexandrite gemstone is an investment, and being able to distinguish between real and fake stones is essential. By following the techniques and tips outlined in this article, you can confidently navigate the market, make informed decisions, and cherish the beauty of a genuine Alexandrite gemstone for years to come.

Note: It is important to mention that while the methods provided in this article are commonly used to identify real Alexandrite gemstones, they may not guarantee 100% accuracy. Consulting with a professional gemologist is always recommended for a definitive assessment.