Detecting enhancement in unmounted diamonds is relatively easy, however mounted diamonds can be quite difficult because the mounting can obstruct your ability to view the diamond from all angles and tends to wash out the flash effect. For this reason, we recommend that you always inspect diamonds unmounted. You will most likely have to inspect the diamond from several different directions. Diamonds treated recently by Yehuda flash violet purple to pink when examined using dark field illumination and green to yellow using bright field illumination. Diamonds treated by other companies exhibit similar colors but they appear more saturated than those found in Yehuda treated diamonds.
Most fracture filled diamonds contain air bubbles that have been trapped inside the filling.
In some cases they appear as tiny pinpoints and others may be quite large. If you detect a vivid, yet somewhat elusive, flash of color the diamond is probably enhanced, but not necessarily. Natural iridescence in an unfilled break or crack within a diamond can resemble the flash effect left by the enhancement process. If you are uncertain as to whether a diamond has been fracture filled, we recommend you have it examined by a qualified Graduate Gemologist who is not affiliated with the store you are dealing with. Well here's the equivalent for diamonds.