Identification of photoluminescence systems in natural diamonds suggests unique structural properties.
Three photoluminescence systems with equidistant lines were identified in the natural diamond. The 585 nm system with a series of 5 to 12 doublets is characteristic of nickel-containing crystals. For diamonds with signs of plastic deformation, a 690 nm system with three local maxima of 617, 626 and 636 nm is observed. The 890 nm system, accompanied by 912 and 933 nm centers, is a sign of a perfect crystalline diamond structure.
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Lepekha et al. (2026) studied this question.
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