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Pleochroism: Dichroic - Golden: weak (yellow to light-yellow); Goshenite: colorless, no dichroism; Green: distinct (yellow-green to blue-green); Heliodor: weak (gold-yellow to greenish-yellow); Morganite: distinct (pale-pink to lavender-pink); Purple: distinct (purple to colorless); Yellow: (light yellow to medium yellow).

Treatments: Aquamarine is usually heat treated to remove the greenish cast.  Morganite may be heat treated to change the peachy coloring to pink and may also be irradiated.  Bixbite and heliodor may be heat treated and irradiated.  Goshenite may be heat treated.  Emerald is almost always treated with some filling agent to reduce the visibility of inclusions.  These treatments are controversial and there is no consensus as to which treatment, if any, is appropriate.

 

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