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https://www.gemsociety.org/article/assembled-stones-jewelry-and-gemstone-information/
Although beautifully colored, some deposits are too thin and fragile to be used for jewelry. However, cementing one of these thin layers onto a strong backing, such as black onyx, black opal, or something similar, creates a doublet or triplet. A doublet is a thin layer of opal glued to a black base. A triplet adds a transparent cap layer.
https://www.opalauctions.com/learn/opal-information/definition-of-doublet
A doublet is a stone made of two materials: the first is a natural sheet of gemstone, like solid opal, and the second is a solid backing, like ironstone. An opal doublet isn’t made from 100% opal. Instead, a piece of solid opal is attached to a different material backing.
https://www.merriam-webster.com/dictionary/doublet
Definition of doublet. 1 : a man's close-fitting jacket worn in Europe especially during the Renaissance. 2 : something consisting of two identical or similar parts: such as. a : a lens consisting …
https://en.mimi.hu/jewelry/doublet.html
Doublet A composite gemstone consisting of two pieces of the same or different gem materials, or one gem material and a second of glass . A very common …
https://www.gemselect.com/other-info/gemstone-doublets.php
Jul 11, 2009 · A doublet is a gemstone that is composed of two parts; usually valuable gemstone material in combination with other, less expensive material. This is not a natural occurrence, but rather a man-made fabrication where two pieces of material are glued together to form a sort a composite or "gemstone sandwich".
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