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Help Needed: Uncut Diamonds Categorization


Andrii
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Guys,

 

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

 

Cheers,

Andrii

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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

 

Thanks!

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