The Ideal-scope has a hot red / pink reflector and a lens with which to see just how much of the red / pink light above the diamond is returned to your eye. It is a simple light return gauge; white areas in a diamond show that light can be transmitted from behind the diamond; this is called leakage - the enemy! The darkness of the lens mimics your head blocking out the light. The most brilliant diamonds look bright pink/red. A black star pattern shows the diamond is symmetrical. Most ideal cuts have small 'V' shaped white leakage features at the girdle.
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