A description is given of so-called coated diamonds which consist of a clear core surrounded by an opal-like layer or coating. From a careful microscopical study of this coating, which is pure diamond, wherein minute foreign particles are embedded, a suggestion is made as to the growth pattern of the diamond. Growth is found to occur not only in waves, which include angles of 60°, but growth angles of about 80° are also observed. Attention is drawn to curious string formations of the embedded particles in the coating.

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