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Summer 1989, Volume 25, Issue 2

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The Characteristics and Identification of Filled Diamonds
John I. Koivula, Robert C. Kammerling, Emmanuel Fritsch, C.W. Fryer, David Hargett, and Robert E. Kane


The filling of surface-reaching cleavages, fractures, and other separations in diamonds has generated a great deal of concern during the last two years. This article reports on the study of six diamonds both before and after a filling treatment and the examination of 12 additional filled stones. Microscopy provides the best means of identifying a stone that has been filled. Chemical and other analyses indicate that the filling material is a type of glass. The filling will not withstand all standard jewelry manufacturing and repair procedures.



Appears on pages 68-83

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