Glossary Term
By Dr. Elif Demir Mineralogy Editor
The optical phenomenon of a star-shaped reflection appearing on the surface of a cabochon-cut gemstone, caused by light scattering from oriented inclusions. Asterism is not characteristic of color-change diaspore; the gem is typically faceted than cabbed and shows pleochroism plus alexandrite effect than star phenomena.
We use cookies to enhance your experience. Choose which categories of cookies you allow. You can change your preferences at any time.
Required for the website to function. Cannot be disabled.
Enable personalization features like language preferences and accessibility settings.
Help us understand how visitors use our website to improve the user experience.
Used for targeted advertising and tracking across websites.