Dutch Rose Round
GemCad Ray Traces for RI = 1.54
Random Model Cosine Model ISO Model
GemCad Ray Traces for RI = 1.72
Random Model Cosine Model ISO Model
Dutch Rose Round
Designed by Bob Keller - 11.22.01 Bob Keller
For RI 1.54 and up - likes garnet and corundum!
Angles for R.I. = 1.54 and up 48 facets + 12 facets on girdle = 60
6-fold, mirror-image symmetry 96 index
L/W = 1.000 P/W = 0.420 C/W = 0.212H/W = (P+C)/W+0.02 = 0.652 P/H = 0.644 C/H = 0.326
Vol./W^3 = 0.194 Brightness at 0 degrees tilt for RI = 1.54 COS = 81.9 ISO = 88.1
Brightness at 0 degrees tilt for RI = 1.72 COS = 81.7 ISO = 91.8
Pavilion
1 41.00 04-12-20-28-36-44-52-60-68-76-84-92 Meet at centerpoint, make culet
g1 90.00 04-12-20-28-36-44-52-60-68-76-84-92 Match 1, make level girdle
Crown
a 45.00 04-12-20-28-36-44-52-60-68-76-84-92 Match g1, establish upper girdle line
b 34.00 06-10-22-26-38-42-54-58-70-74-86-90 Meet a.g1.g1
c 25.30 96-16-32-48-64-80 Meet b.a.a.b
d 12.00 96-16-32-48-64-80 Meet c.b.b.c, at apex

A Dutch Rose Round Design File is available for GemCad users.


Index of Gem Designs

Perfect Transfer Index

Table of Contents


© Bob's Rock Shop Bob Keller