Synthetic Gemstones :: Synthetic gemstones are made in laboratories or factories, not in rocks. They virtually have the same chemical composition and crystal structure as natural gemstones and consequently their optical and physical properties are very similar. However, they can usually be identified by the difference in the inclusions in them. Many types of gems have been synthesized but only a few are produced commercially, generally for scientific or industrial use.
Because of the way the synthetic gems are made, they show subtle differences in shape and colour that help to distinguish them from their natural counterparts. Similarly, the synthetic gems have inclusions, which are different from the natural inclusions. The experts can identify them and distinguish.