What Is Alexandrite?

Alexandrite changes color because its chromium content absorbs light differently under different light sources. In daylight it usually looks green or bluish green, and under warm indoor light it looks red or purplish red.

The strongest stones change completely and clearly, with both colors saturated. Weak stones shift only slightly, or show muddy tones in one light.

Natural alexandrite is rare, especially in large sizes, which makes it costly. Lab-grown alexandrite shows the same color change and is far more affordable.

For jewelry, lab-grown alexandrite is often the practical choice, since it gives a strong color change at a price that allows a larger stone. Natural stones suit collectors most.

Alexandrite rates 8.5 on the Mohs scale, which makes it hard enough for rings worn daily, though less hard than sapphire or diamond.

Protective settings such as bezels and low baskets suit alexandrite rings, since even hard stones chip at exposed points. Pendants and earrings need less protection.

Compare the stone under daylight and under warm indoor light before buying, since photos show only one light. A good stone changes clearly in both.

Clarity matters less than color change for alexandrite, but avoid stones with visible inclusions in the center of the face-up view.

Clean alexandrite gently with mild soap and water, and dry it fully. Avoid ultrasonic cleaners for stones with visible inclusions or fragile settings.

Store alexandrite separately from harder stones such as diamond and sapphire, which can scratch it over time.