Color can be just as deceptive as clarity in grading. Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow. Even in a glassie, color may end up two to three grades lower after finishing. If the buyer is working with a very close margin between the buying price and the predicted selling price, that will often bring disaster. A cutter may have a gut feeling for the color outcome, but 100% accuracy is never possible.