I've found a great price on a clarity enhanced diamond, what do they mean by clarity enhanced?

With the improvement of laser technology they are able today to actually drill a hole in a diamond and force bleach or other agents into the carbon spot or the feather and make it lighter in appearance. Also they are able to enhance with color or heat treating and enhance the appearance of the diamond artificially. Both of the these process are outside influences and can problems and excessive damage to the diamond down the line. We stay away from these diamonds because they are not a bargain for our customer, they are less expensive than other diamonds of similar appearance however they are not at a value that is less than other diamonds.