Coloured stone professionals assess fine alexandrites by the extent of the colour change they display and by the quality of the red and green hues they show under different lighting conditions.
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What to look for
Alexandrite Quality Factors: The Comprehensive Guide
Tips & Advice
1. If it seems too good to be true, it probably is.
Natural alexandrite is rare and valuable. An inexpensive gem with a strong red-green colour change is likely to be a synthetic or simulant.
2. Work with a jeweller you trust.
Judging the quality of alexandrite requires expertise. Look for gemmological credentials. A jeweller who knows and loves alexandrite will welcome the challenge to find one that’s right for you.
3. When in doubt, get a lab report.
For a significant purchase an independent laboratory report can confirm that the alexandrite you are buying is natural.
4. Don’t expect to be able to match alexandrites easily.
Creating pairs or suites of alexandrite for earrings, a three stone ring or a necklace is very challenging. Matching size, shape, colour and colour change is particularly difficult.