Following a feasibility study of computer-aided gem testing, which resulted in a student-level gem identification program, the author has developed a professional version containing data on over 200 gem materials and gem simulants. The program sections include Gem Identification (using test inputs for R.1, values, optic sign, S.G., etc.), Gem Data Tables (arranged in alphabetical, R.I., and S.G. order), Gem Data Comparisons, Gem Data Pages, and Gem Calculations (for determinations of S.G., reflectivity, critical angle, and Brewster angle). This type of computer program provides rapid access to gem constants and characteristics, and can assist the less experienced gemologist by identifying unfamiliar or rare stones and indicating the various alternatives.
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