Letters

Assessing Cut On page 100 of the September 1999 issue of JCK, in an article about the Gemological Institute of America Symposium, a statement reads, “Panelist Al Gilbertson, an appraiser from Portland, Ore., said that he and others are already using spectrophotometers for [measuring brilliance and dispersion]—so who needs computer models to determine angles and percentages?” This is not a statement I would have ever made, nor do I know of any scientific work that supports it. I certainly think that GIA’s work is needed, contrary to the inference. While I have a slightly different view of some of the issues as they were discussed in Gems & Gemology, their contribution is invaluable to our understanding. To be specific about the above statement, I am unaware of any spectrophotometers that have been proved scientifically to actually measure brilliance or dispersion. So far
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