What is alexandrite?
By Jared James · Last updated 21 May 2026
Definition
Alexandrite is a rare variety of the mineral chrysoberyl, famous for one remarkable trick: it changes colour depending on the light. In daylight it usually looks green to bluish-green, and under warm indoor or candlelight it shifts to a soft red, purple or raspberry. That dramatic change, sometimes described as emerald by day and ruby by night, makes natural alexandrite one of the most sought-after and expensive gemstones, and it is also a birthstone for June.
Frequently asked questions
- Why is alexandrite so expensive?
- Natural alexandrite is genuinely rare, especially in stones that show a strong, clean colour change, so good material is hard to find and prices are high. Lab-grown alexandrite offers the same effect at a far lower cost.
- Is alexandrite a real gemstone?
- Yes, it is a natural gemstone and a colour-change variety of chrysoberyl. There is also lab-grown alexandrite, which is real alexandrite made in controlled conditions rather than mined.
- What birthstone is alexandrite?
- Alexandrite is a birthstone for June, sharing the month with pearl and moonstone, so it is a popular modern choice for June birthdays who want something with a bit of drama.
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