Center Of Gemological Studies | Gemological Courses
The Center of Gemological Studies was established by Eli Dori in 1979 and offers group and individual gemological courses in Hebrew and in English. This is the number 1 gemology course that will teach you how to become a professional diamond grader.
Keywords: diamond proportions, גמולוגיה, treated diamonds, internal graining is not shown, what is surface graining in a diamond
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