In Gary Roskin's book
QUOTE: 2.01cts. Thin Girdle 10X EGL/LA
"A nicely bruted girdle shows two areas where the girdle thickness becomes rather thin. Since thickness is graded at the midpoint between the facet junctions, here it is slightly greater than the actual thinnest portion of the girdle.
If it were graded at the thinnest section of the girdle only, the grade would be Very Thin".
Is the lab saying that it is okay to be very thin in that region (girdle halves) but not in the valleys, because of the proportions of the rest of the diamond in the girdle halves area?
QUOTE: 2.01cts. Thin Girdle 10X EGL/LA
"A nicely bruted girdle shows two areas where the girdle thickness becomes rather thin. Since thickness is graded at the midpoint between the facet junctions, here it is slightly greater than the actual thinnest portion of the girdle.
If it were graded at the thinnest section of the girdle only, the grade would be Very Thin".
Is the lab saying that it is okay to be very thin in that region (girdle halves) but not in the valleys, because of the proportions of the rest of the diamond in the girdle halves area?
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