nightstone A term adapted by the author to describe a gem species or variety that looks its best in incandescent light, showing its most saturated hue. Traditionally, an opal that retains a strong play-of-color in low light environments.
Crystalline nightstones: the creme de la cerme
Diaphaneity transparency or more commonly "crystal" is the true fourth C of colored gemstone evaluation. As mentioned, tourmaline is normally a daystone. That is, it looks its best in natural lighting.
475 - 495
20 x [Nightstone Choker] - 20 Jeweler's Setting, 40 Nightstone ...
 See also: Brilliant, Gem, Stone, Point, Cut
  
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