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Quote from Educational Articles:Criteria used in determining country of origin of blue sapphires Identification of inclusions is the first criterion used by gemologists in determining the country of origin of a blue sapphire.The presence of inclusions that are unique to certain sapphire producing regions, can be easily used in identifying the source, eg. the presence of needle-like pargasite [...]
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Posted : 04/12/2021 8:46 am