raduis of amper loop is greater than than the radius of its own toriod..than this toriod is called ideal toriod
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toroid
There are many possible answers. Some are: A sphere or ellipsoid sliced by two planes A cone sliced by two planes A toroid (doughnut) with a wedge cut out An infinite circular prism sliced by two planes.
The intersection of two ideal lines
Independent grading labs use different metrics to evaluate the cut. The scale from best to worst is: Ideal (AGS only) Excellent (AGS, GIA) Very Good (Most labs) Good (Most labs) Fair (Most labs) Poor (Most labs) Each grading lab has slightly different criteria, though it is generally accepted that AGS is the most strict followed by GIA then EGL, then any others as less strict (e.g. a "Very Good" from a less strict lab may be graded as a "Good" by a more strict lab). Many companies use the term "ideal" to describe their best diamonds they sell, though they may not actually be independently graded as "Ideal".
If the diamond is an ideal emerald cut with these measurements, the diamond may weigh about one quarter of a carat. Otherwise, you have stated the diamond's 'big' size in measurements.