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A simulation of a gemstone that is made of two or three layers of gemstone or glass that are cemented or fused together so as to appear as a whole natural stone.
The purpose is to provide a more attractive colour or a protective top surface (as for an opal).
They can be distinguished from genuine stones by several tests:
Such stones are sometimes called an 'assembled stone'.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson