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We made adjustments to a few of the definitions in the commodities ontology under DER-105. Note that diamonds are considered extraction resources in the CFI and we don't call out precious stones separately to date. Interesting related articles include: https://www.diamonds.net/news/NewsItem.aspx?ArticleID=66174,
https://www.marketwatch.com/story/diamonds-may-have-a-future-as-a-commodity.
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