An assembled gem (also called a composite gem) is a gemstone made up of other smaller gems. An assembled gem can often be a fake gem with a desirable piece of gemstone attached to pieces of inexpensive imitation gemstones. For example, a combination of a thin layer of green glass and a colorless piece of quartz would be a composite gem.
Types
A doublet is a type of assembled gem which is composed of two parts. A false doublet is a doublet which is a glass piece that looks like a real gem and a real gem that have been attached to look like a larger gem.5 A triplet is a type of assembled gem composed of three distinct parts.6
References
Read, P. G. (2013-10-22). Gemmology. Elsevier. ISBN 9781483144672. 9781483144672 ↩
"Assembled gem". The New Encyclopaedia Britannica. Encyclopaedia Britannica. 1992. ISBN 9780852295533. 9780852295533 ↩
"Fake Gemstones". The Spruce. Retrieved 2017-10-20. https://www.thespruce.com/avoiding-fake-and-manipulated-gemstones-2042960 ↩
Petersen, Christine (2010-01-01). Groovy Gems. ABDO. p. 23. ISBN 9781616139339. composite gem. 9781616139339 ↩
Matlins, Antoinette Leonard; Bonanno, Antonio C. (2009). Jewelry & Gems, the Buying Guide: How to Buy Diamonds, Pearls, Colored Gemstones, Gold & Jewelry with Confidence and Knowledge. Gemstone Press. ISBN 9780943763712. 9780943763712 ↩
Matlins, Antoinette Leonard; Bonanno, Antonio C. (2009). Jewelry & Gems, the Buying Guide: How to Buy Diamonds, Pearls, Colored Gemstones, Gold & Jewelry with Confidence and Knowledge. Gemstone Press. ISBN 9780943763712. 9780943763712 ↩