multicolor effect The display of divergent colors or tonal variations of the same color on a gem viewed in the face-up position.
nacre The mother-of-pearl secretions of the mollusk; pearl essence.
Multicolor effect
As tourmaline is the most dichroic of gemstones, a strong multicolor effect is to be expected.
 See also: Clarity, Color, Gemstone, Inclusion, Hue
  
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