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See also https://www.educba.com/commodity-derivatives/
We made adjustments to a few of the definitions in the commodities ontology. 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.