syn·thet·ic gem·stone | sin-ˈthe-tik jem-ˌstōnz
A gemstone that was produced in laboratory rather than found in nature
Synthetic gemstones are not fake, since they have exactly the same chemical characteristics as the natural stone. They are usually flawless and much more affordable than the real thing. The most common synthetic gemstones are diamonds, emeralds, rubies, sapphires, and opals.