Abstract
WE have applied the multiple-beam interference technique described earlier1 to the study of the topography of a natural octahedron face of a diamond, thus revealing considerable information about growth, etch, face curvature, etc. We have settled a fifty-year-old controversy concerning the origin of the beautifully regular shallow-pit triangular markings shown by such faces. Miers2 cautiously stated that these are supposed to be due to etching and shows them pointing to the octahedron edge. Fersmann and Goldsmidt3 asserted that etch or solution can be responsible both for the triangles and the curved faces. Williams4 proposed on rather slender grounds that the triangular pits and curved faces arise from growth and not from solution.
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