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.Blue is blocked by the observer (some blue adds contrast)Red is best: most light comes from above –from the ceilingGreen is OK; it is reflected and from windows, but red is betterWhite shows how much leakage is present (bad, especially when the leakage is adjacent to blue; this often results in a large dark zone in normal lighting) AGS quantify’s blue, red, green and leakage with its Performance Grading Software™ in 1° steps of tilt from 0° to 45° Face-up (0°) is weighted much more than 45° We recommend tilting the stone to about 15° while looking at it through your ASET scope ‘Face Up’ counts the most Downgrade leakage – for a lot, or large zones Downgrade for mostly green & little red Downgrade for too much or too little blueOur Recommendations in using ASET Scope We prefer to back light diamonds Comparing brightness of colors is easier Seeing leakage makes it easier to discern good from poor stonesThe best way to use ASET is rock stones from side to side as shown on the movies We recommend you ‘weight’ 50% from the face up view and 50% from rocking views While not ‘scientific’, with some practice you can identify stones that look bad when tilted For buying fancy cut stones, we recommend initial face up selection with an Ideal-scope – followed by final selection using your ASET
