Comparison between correct and incorrect facetting angles of the pavillion

for synthetic spinel with a refractiv index of 1.72. These two cuts are perfectly identical and from the same rough. The only differenc is the facetting angle of the pavillion.

Brilliant cut    Brilliant cut
A perfect cut.   A cut with a window
This spinel is cut in a perfect way. Color and brilliance are intense and you can not see through.   This incorrect cut shows no brilliance and the color is less intense. You can see the two lines of the background through the stone. This effect is called a window.
43 degrees is the smallest angle of the pavillion.   28 degrees is the smallest angle of the pavillion.
Compare the difference between the pavillions of these two stones. Here the pavillion angle is 43 degrees.   Here the angles are to flat. 28 degrees is the pavillion angle, this creates the effect of a window and a loss of brilliance.
Hubert Heldner June 2000
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