Diamond in Diamond
The exposed crystal inclusion had the morphology of a natural diamond crystal, and Raman analysis easily identified it as diamond. Both the host diamond and inclusion show sharp 1332 cm–1 Raman bands, indicating high crystallinity. The graphite peak at approximately 1580 cm–1 was not observed in either. Raman mapping showed that the full width at half-maximum (FWHM) of the inclusion’s 1332 cm–1 peak was different from that of the host diamond (figure 2, center). In the map, each colored pixel represents the FWHM value of the 1332 cm–1 Raman peak. The colored pixels of the inclusion were decidedly different from those of the host diamond, confirming that it formed in a different geological environment. We also observed differences between the photoluminescence (PL) spectra of the inclusion and the host diamond, evidence that the diamond inclusion formed in a different environment and was later incorporated as a protogenetic inclusion. This also suggests that this diamond may have traveled from its original formation environment to another geological environment after crystallization.
A DiamondView image shows the diamond crystal to have been captured in a second growth phase of the host diamond crystal (figure 2, right). This is the first documented case of a diamond crystal inclusion with a different origin than that of the host diamond.
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