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Alexandrite Effect vs Usambara Effect

Alexandrite Effect vs Usambara Effect in color change gemstones

www.alexandrite.net/discussion/post/alexandrite-effect-vs-usambara-effect-FRM-323-00001

The Purkinje Effect

Color change in the Tavernier diamond could be actually the Purkinje effect

www.alexandrite.net/discussion/post/the-purkinje-effect-FRM-323-00003