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Help Needed: Uncut Diamonds Categorization


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Kindly advise if there is any offcial rough stones categorization - e.g. one from DTC for gems


For example which say that for formation of price they use the crystalline shape, the rough weight, the color and the clarity and which specific subcategories for each


Would be happy to get any kind of categorizations with sources or just kindly inform if there are no such a things




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None "official", as far as I know. There are differences based on colour, clarity, sawability of rough, shape, but they are all "trade-based" and there are no standards enforceable (in other words: caveat emptor; buyer beware)

Thanks - do you have any links to some example of classifications or at least their names have heard of one called CITY, but found no data



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