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The Round Brilliant/Tolkowsky's Cut
The Depth (Or Height) Of The Diamond
The
Russian Mathematics genius Tolkowsky's recommended cut height for a Round
Brilliant is 59.3% that of the diameter of the diamond, which breaks down
to about 43% for the pavilion, and 16% for the height of the crown. This
59% is probably the most crucial dimension of the stone.
You will see diamonds that are too shallow (the height is significantly
smaller than 59%) or too chunky (significantly over 59%). Don't buy stones
which deviate too much from this value. In practical terms you want to
find a diamond at approximately 60% depth and 60% in table percentage
as a good rule of thumb.
The Table of the Diamond
Probably the most noticeable proportion on a Brilliant Cut diamond is the size of the table.
Tolkowsky found the table to be ideal at 53% of the diameter of the stone. But the Eppler Cut and the Scandinavian Cut have tables at 56% and 57.5% respectively. The appraising guidelines penalize diamonds with tables above 64% pretty severely, when you go shopping, you'll see tables all the way into 70's. Table percentage should be in the upper fifties or lower sixties...
Imagine that!!!!!!!!!!
