Updated: Apr 23, 2019
Contrary to what may come to mind when you hear the word "synthetic", it does not mean fake when it comes to opals. To be classed as 'synthetic' the stone will be a man made version of a material that occurs in nature.
A synthetic opal will have the same chemical composition as a naturally occurring opal and therefore they have an almost identical appearance to the naked eye.
As a general rule, if you are buying an opal that is set in #silver it is safe to assume that it is synthetic. (This rule also applies for turquoise)
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