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Some gem-quality octahedral diamonds from Diavik Mine, Slave Craton, have abundant shallow planar trigons over part or all their surfaces or above macle and fracture lines (Fig.1). Microscope observation of the etched surfaces revealed the occurrence of micro-inclusions (< 0.5 μm) concentrated in layers ~ 10-15 μm beneath the surface. Areas with higher concentration of micro-inclusions are separated by curvilinear boundaries from smaller areas where they are absent. The micro-inclusions are rounded with small single fractures extending from them, producing a tadpole-like shape. The microfractures can be both crystallographically (111) and randomly oriented (Fig.1). Shadows of trigons can be seen under non-etched surfaces, suggesting that diamond growth on those faces continued after etching. Micro-inclusions are also seen along fractures and macle lines associated with trigons.

Micro-inclusions in monocrystalline octahedral diamonds from Diavik, Slave Craton: clues to diamond genesis