Most diamond grading organizations in Japan have adopted 4C which
is the grading notation of the Gemological Institute of America.
Each Diamond Grading Report is published according to an original format on the basis of "4C" by each grading organization.
Each certificate shows the measurement and test results which form the basis for the weight and quality of the diamond
A photograph, the size and proportions, the fluorescent strength when it is irradiated and the clarity are listed there.
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