An assembled gem (also called a composite gem)[1] is a gemstone made up of other smaller gems.[2] An assembled gem can often be a fake gem with a desirable piece of gemstone attached to pieces of inexpensive imitation gemstones.[3] For example, a combination of a thin layer of green glass and a colorless piece of quartz would be a composite gem.[4]


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.[5]


  1. ^ Read, P. G. (2013-10-22). Gemmology. Elsevier. ISBN 9781483144672.
  2. ^ inc, Encyclopaedia Britannica (1992). The New Encyclopaedia Britannica. Encyclopaedia Britannica. ISBN 9780852295533.
  3. ^ "Fake Gemstones". The Spruce. Retrieved 2017-10-20.
  4. ^ Petersen, Christine (2010-01-01). Groovy Gems. ABDO. p. 23. ISBN 9781616139339. composite gem.
  5. ^ a b 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.