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Emerald Triplets. A careful examination of one of these triplets, in the unset condition, with a good lens, will reveal the thin line of junction of the beryl with the glass.
Emerald triplet: An assembled stone. Two parts, the top and the bottom are either quartz, pale beryl or synthetic spinel and the third part usually is a layer of green cement, serving a colorant while gluing the top to the bottom.
 See also: Glass, Eye, Alexandrite, Beryl, Depth
  
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