Composite Gemstone
It refers to a gemstone which is assembled from several pieces, often used to imitate a gem.
Corundum ...
Composite gemstones are most realistic if natural gem material is used for the crown of a faceted gem, as casual inspection reveals natural inclusions.
A composite gemstone consisting of two pieces of the same or different gem materials, or one gem material and a second of glass.
Doublet: A composite gemstone of either simulated materials or natural gemstones. Most often seen are opal doublets and triplets that have a layer of quartz, opal and chalcedony base or garnet and glass doublets.
Ultra gems
Shavings of different pieces of stones are bonded together by karat Gold, to produce this composite gemstones. The ultra gem which is a blend of high technology and expert craftsmanship, is a strong and durable gemstones.
 See also: Gemstone, Stone, Doublet, Gemstones, Natural
  
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