The Ideal-Scope is based on a principle discovered by Mr Okuda in the 1970s. A lens with a hot pink reflector lets you see how much of the red/pink light comes back from the diamond.
An Ideal-Scope is a simple diamond brilliance/leakage gauge; the most brilliant diamonds look bright pink/red with a black star and minimal white or pale areas. White areas in a diamond show light transmitted from behind the diamond called leakage – the enemy! The blackness of the lens mimics an observer’s head blocking out the light. Ideal cut round diamonds have small ‘V’ shaped white leakage features at the girdle.
An ideal-Scope also shows a diamonds symmetry and many vendors will use an ideal-scope photo for the ‘arrows’ and a Hearts and Arrows (H&A’s) scope image for the ‘hearts’ or rear of the diamond view. This is a great idea because the ideal-scope image provides more info on the diamonds cut than a arrows image. The main difference is the H&A’s scope shows the arrows as white where-as the ideal-scope shows a black eight-pointed star in symmetrical well-cut diamonds. Both scopes are a by-product of Mr Okuda’s discovery.
Garry Holloway BSc, FGAA, DipDT, NCJV.