When Does the Color Change for an Alexandrite Stone

Imagine owning a gem that can transform its colors like a chameleon, captivating your senses with its mystical allure. This enchanting gem is none other than Alexandrite.

In this blog post, we will delve into the captivating phenomenon of an Alexandrite stone’s color change, exploring the science behind it, the conditions that trigger this magical transformation, and why it remains one of the world’s most beloved gemstones.

The Astonishing Alexandrite Color Change

When does the color change for an Alexandrite stone occur?

The answer lies in the type of lighting that graces this remarkable gem. An Alexandrite stone undergoes a spectacular transformation when it transitions from daylight or fluorescent light to incandescent light.

This optical marvel is a result of the stone’s unique interaction with different wavelengths of light depending on the light source.

In daylight or under fluorescent lighting, Alexandrite absorbs red and orange light, but it reflects green and blue light. Consequently, the stone appears predominantly green when viewed under these conditions.

However, the real magic happens when you introduce incandescent light into the equation.

Under incandescent light, Alexandrite absorbs green and blue light, but it reflects red and orange light. As a result, the stone takes on a mesmerizing red or purplish-red hue when bathed in the warm glow of incandescent lighting.

The Role of Light Spectrum

To witness the most dramatic color change in an Alexandrite stone, you’ll want to view it under a light source that emits a broad spectrum of light.

Sunlight and fluorescent lamps are excellent examples of such light sources. As the light shifts from one side of the stone to the other, you’ll observe the stone transitioning from green to red, or vice versa.

It’s a sight to behold and a testament to the uniqueness of this gem.

The Impact of Alexandrite Cut

While the magic of Alexandrite’s color change is primarily dictated by the light source, the cut of the stone plays a significant role. A well-cut Alexandrite gemstone is a masterpiece that maximizes its color-changing effect.

The precision of the cut ensures that the gem interacts with light optimally, resulting in a more pronounced and vivid transformation.

Conversely, if an Alexandrite stone is cut too thick, it may not allow sufficient light to pass through, leading to a less noticeable color change.

On the other hand, if the stone is cut too thinly, it can permit too much light to pass through, again diminishing the impact of the color change. The art of cutting Alexandrite requires skill and precision to unlock its full potential.

The Fascinating Alexandrite Effect

The magic of Alexandrite’s color change is an enthralling phenomenon rooted in the gem’s unique ability to absorb and reflect light.

This captivating effect has earned Alexandrite a special place in the world of gemstones. Its rarity, coupled with its awe-inspiring transformation, makes it highly sought after by collectors, jewelers, and anyone with an appreciation for the extraordinary.


The color change of an Alexandrite stone is a wondrous spectacle that unfurls when it encounters different light sources. This phenomenon, which can turn the gem from green to red or purplish-red, has captivated the hearts of gem enthusiasts for generations.

Whether you’re a connoisseur of gemstones or simply someone who appreciates nature’s unique marvels, Alexandrite is a gem that never fails to mesmerize.

Also Read: What is Alexandrite Stone

Jyotish Varsha Gupta
Varsha Gupta


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