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What is The mathematical name for a tube like shape?
toroid
Which 3d shape has 3 faces?
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.
What is the geometric definition for point?
The intersection of two ideal lines
Is a Ideal cut much better than a very good cut diamond?
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".
How big is a diamond 5mm by 3mm?
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.
