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The Argyle lamproite mine is world famous for fancy colored diamonds, ranging from cognac and champagne shades of brown through Cape yellows to rare pink to intense red and even rarer blue stones. The majority of diamonds are type IaAB, displaying platelet degradation and having plastic and brittle deformation, mainly after diamond formation, indicative of high pressure/temperature conditions. The deformation produced optical defects, causing different Argyle diamond colors.

White and brown Argyle diamonds belong to both eclogitic and peridotitic parageneses, but yellow- and pink-colored ones studied here are eclogitic. Nitrogen contents, N aggregation states, and formation temperatures of yellow...

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