Rough Diamond Prices Guide
x 2,500 x (40%) = 1,875 (for one diamond), total 3,750 (for two polished diamonds). To obtain our purchase price for this rough diamond of 5 carats, it is necessary to apply a percentage which will correspond to our profit margin (on average it is best at 50%): 3,750 x = 1,875 (this is our purchase price for this rough diamond).