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After the diamond mining ore through hardships, the need to go through multi-channel processing selection, before derive rough diamonds. Rough diamond, only about 20% can be used for jewelry purposes of rough, but most can only be used for cutting, grinding and polishing and other industrial uses. It has been a rough estimate is too, to get 1ct weight of diamonds, at least to deal with 250 tons of ore mining, harvesting rate is quite low; if you want to pick out the diamonds from the finished drill, that the ratio between the two is very poor of the.