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http://dx.doi.org/10.6111/JKCGCT.2013.23.4.173

The analysis of optical influence on the grading tolerances and proportions for the round brilliant cut polished diamonds  

Kim, Eun-Ju (Dept. of the Faculty of Arts & Profession and Industrial Design, Dongshin University)
Abstract
Even though a rough diamond shape is irregular and rugged, it is easy to be processed to make gem, shaped facets (table, crown, pavilion and girdle) were precisely treated because they influence on the evaluation of diamond grading. Those specifications suitable for the standard round brilliant cut diamond polishing were investigated and in 95 % statistical confidence interval, standard deviation, mean and acceptable tolerance were examined. According to these variables (size, angle, depth, and thickness) distribution, the frequency analysis of ratings and proportions were compared with each other. The correlation between each variables and the evidence of influence represented in proportion were determined by the regression analysis applying LSM (Least Square Method). In this research, it was recognized that table sizes of the diamond jewels and pavilion depth (in %) influence the rating decision and in particular, the depth of pavilion acting as the main factor of proportions, also plays an important role in optical phenomena.
Keywords
Round brilliant cut; Diamond; LSM; Tolerance; Proportions; Optical influence;
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