Verskil tussen weergawes van "Ametrien"

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* [http://www.gia.edu/newsroom/issue/2798/2462/insider_newsletter_details.cfm#4 Insider Gemologist: What Are the Identifying Characteristics of Citrine, Ametrine, Smoky Quartz, and Scapolite?] {{webarchive |url=https://web.archive.org/web/20060905235601/http://www.gia.edu/newsroom/issue/2798/2462/insider_newsletter_details.cfm#4 |date=5 September 2006 }}
 
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