“…However, it was not until the in situ diamonds were discovered in the Luobusa and Polar Ural chromitites as well as the Nidar mantle peridotites [24,35]. Particularly, ophiolite-hosted diamonds have inclusions of fluid and Mn-Co-Ni alloy and obviously show trace elements, e.g., Ba, Pb, Th and Eu, and crust-derived carbon-nitrogen isotope compositions different from those of synthetic diamonds [5,36,37]. Following the independent discovery of diamonds in ophiolitic mantle peridotites and chromitites by Australian, Spanish and Indian geologists, the occurrence of the ophiolite-type diamond was widely accepted [35,36,38,39].…”