An ASET scope is like an Ideal-Scope but gives you more detailed information about a diamond. It is most beneficial for rejecting fancy shaped diamonds. Fancy shaped diamonds are more complex than round diamonds. A face-up ASET image may look great but with a tiny tilt large leakage (white) or dark zones (blue) may appear. It is best to rock a diamond while viewing it with an ASET scope as shown in this demo.