I found Boro Rapaic's comment on laboratory-made opals intriguing. He has labelled synthetic opals as artificial stones/fake. Check out the link http://www.abc.net.au/worldtoday/content/2008/s2590411.htm
Here is the definition of synthetic vs imitation vs natural:
Synthetic gem: Same as natural gem (in terms of composition, structure, properties and appearance), except made by humans. Must have a natural counterpart.
Imitation: A gem material (natural or otherwise) which has the same appearance as the gem it imitates.
Natural: A gem material which entirely the product of nature. It is unaltered by humans in any way, except for ordinary cutting and polishing (no impregnations).
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