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  1. IS Ref Chart

  2. Ideal Light

  3. Light Return

  4. Head Shadow

  5. New GIA & AGS

  6. IDCC Conf.

  7. DC Prop. Est..

  8. Taking IS Photos

  9. Using ASET Scope

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Ideal-Scope Newsletter # 9
   
Ideal-Scope Logo  
September 2006
Issue 9
"see the cut quality of your diamond before you buy"
 
News: New Expert Scopes ready to ship
 
New Expert Scope Assembly
New ASET Scope Assembly
   
ASET Scope - The Best Tool for Fancy Shapes Cut Grading
Picture of Fancy CutPicture of ASET Light Configuration
Graphic courtesy of American Gem Society (AGS)
     
  Blue is blocked by the observer (some blue adds contrast)
  Red is best: most light comes from above –from the ceiling
  Green is OK; it is reflected and from windows, but red is better
  White 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 blue

0 degrees
Pic of DC 0 degrees
Daylight at 0 degrees
5 degrees
Pic of DC 5 degrees
Pic of Daylight 5 degrees
10 degrees
Pic of DC 10 degrees
Pic of Daylight 10 degrees
15 degrees
Pic of Daylight 15 degrees
Pic of Daylight 15 degrees
 
Movie of Daylight ASET - Tilt 0 to 10 degrees
Movie of ASET tilt 0 to 5 degrees
   
   
   
Our Recommendations in using ASET Scope
   
Pic of using ASET

  • We prefer to back light diamonds

  • Comparing brightness of colors is easier

  • Seeing leakage makes it easier to discern good from poor stones
 
   
   

The 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
Pic of stones selection
   
   
   
View our ASET Reference Chart with movies online
 

 

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