All diamonds have carbons and inclusions on the inside the stone that have naturally formed. When a diamond is clarity enhanced that just means by using different types of scientifically proven treatments, those inclusions and carbons can be reduced, or even removed! All clarity enhanced stones are guaranteed not to "lose" or have the enhancement fade. If his were to ever happen just mail the stone back to me and I will have it re-enhanced free of charge!!  Now make sure before you have your stone worked on (such as re-sizing, mounting, re-tipping ect.) ANY WORK THAT INVOLVES A TORCH, OR AN ACID SOLUTION WILL JEOPARDIZE THE ENHANCEMENT!! (IT CAN STILL BE RE-ENHANCED)