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tissue nucleation The use of mantle tissue from a donor mollusk to stimulate the growth of a pearl. A tissue-nucleated pearl is a non-nucleated cultured pearl.
tone The third constituent of color, defined as lightness to darkness.
As tissue nucleation techniques were improved, larger and more uniform pearls resulted, and symmetry improved so that pear, oval and egg shapes became available.
unusually large (10+ mm), near-spherical, freshwater cultured pearls from China that were causing many to question their nucleation process. The joint investigation concluded, however, that they had been created through traditional tissue nucleation.
 See also: Gem, Water, Pearl, Surface, Gemstone
  
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