Rasesh, I became a Graduate Gemologist at G.I.A. in 1972. At that
time, the way one learned diamond grading was by actually DOING it.
As far as I know, that is still the ONLY way to learn.
You need to take the diamond grading class, OR find someone in India
who can teach you. You need to look at HUNDREDS of diamonds…tell
your teacher what grade you would give it, and compare that with the
Diamond grading is NOT scientific and quantifiable, it is a matter of
experience. Those who do it, often cannot tell you specifically what
factors led to a decision, only that they ‘know’ it is XX.
Oddly enough, the system works. Any two graders might differ by one
grade, but with three people grading one diamond, usually two will
agree, if not all three.
Lord of the Rings
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