There are many things that determine the quality of rough diamond evaluation, and lot of these things can be learned on different rough diamond evaluation and grading courses. These courses usually do not last very long but even in this short time you can learn a lot about diamonds that can make the real difference in many cases.
-correct use of a loupe (the starting point that is necessary to proceed further with rough diamond evaluation )-how to tell difference between real and fake diamonds (probably the most important thing in diamond business)-learn to recognize flaws and inclusion on diamond(s) and its influence on final diamond price-learn about all kind of diamond properties (thermal, chemical, mechanical)-how to select rough diamonds that will later be good for fancy shapes-how to determine color of diamond ant the effect color has on diamond price-classification of not only natural but also synthetic diamonds-how good is certain diamond for certain cut, which one is recommended given diamond shape, and number of inclusions.
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