Pleochroism

Pleochroism is a gemological characteristic where a gem shows different colors when viewed from different angles.

Part of speech: noun
Definition: Pleochroism is a fascinating optical phenomenon observed in certain gemstones, where the gem appears to change colors or exhibit different colors depending on the angle from which it is viewed. This effect is due to the differential absorption of light rays within the crystalline structure of the gemstone. Gems like sapphire, tanzanite, and iolite are well known for exhibiting strong pleochroic effects, showcasing a wide array of colors that contribute to their unique beauty and appeal. The observation of pleochroism not only aids gemologists in identifying gemstones but also influences how a gem is cut and set in jewelry to maximize the display of its mesmerizing color variations.