Structure has been revealed in diamonds by etching polished sections with fused potassium nitrate. Several very different types of structure were observed, and an account is given of the principal types, together with illustrations. Both rectilinear and curved line structures were found. The structures are discussed in relation to the kinds of crystal growth which could have caused them. Layer growth parallel to {111} was common, but was not the only kind of growth. A difference has been found in the internal structures of type 1 and type 2 diamonds (infra-red classification). Most of the observations relate to natural diamonds, but some work on synthetic diamonds is reported. No correlation was found between internal structure of natural diamonds and geographic origin.

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