Natural diamonds, because of their great physical resiliency, can preserve information about their formation, storage, and transport conditions for billions of years. Diamond samples therefore provide a unique opportunity to directly study ancient samples of the Earth’s deep interior. To correctly interpret the information diamonds provide, it is essential to accurately constrain the depth of their origin. This depth provenance is usually identified using coexisting minerals that are trapped as inclusions within diamonds during their growth. Comparison of an inclusion’s composition and mineralogy with experimental phase equilibria allows the diamond’s growth conditions to be estimated. While the majority of diamonds...

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