| GemCad Ray Traces for RI = 1.72 | ||
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| Random Model | Cosine Model | ISO Model |
| Six Swifts
Designed by Bob Keller June 2001 Bob Keller |
|
| An Easy to Cut Twelve Sided Round | |
| Angles for R.I. = 1.63 and up | 55 facets + 12 facets on girdle = 67 |
| 6-fold, mirror-image symmetry | 96 index |
| L/W = 1.000 T/W = 0.574 T/L = 0.574 P/W = 0.413 C/W = 0.176 | H/W = (P+C)/W+0.02 = 0.610 P/H = 0.678 C/H = 0.289 |
| Vol./W^3 = 0.200 | Brightness at 0 degrees tilt for RI = 1.72
COS = 79.2 ISO = 87.8 |
| Pavilion | |||
|---|---|---|---|
| g | 90.00 | 04-12-20-28-36-44-52-60-68-76-84-92 | Cut to equal depth, establish size |
| a | 41.00 | 04-12-20-28-36-44-52-60-68-76-84-92 | Match g, make level lower girdle line |
| b | 39.58 | 96-16-32-48-64-80 | Meet a.g, and at culet |
| Crown | |||
| 1 | 42.46 | 04-12-20-28-36-44-52-60-68-76-84-92 | Match g, make level upper girdle line |
| 2 | 37.36 | 02-14-18-30-34-46-50-62-66-78-82-94 | Meet g.1 |
| 3 | 39.57 | 08-24-40-56-72-88 | Meet g.1 |
| 4 | 35.00 | 96-16-32-48-64-80 | Meet g.1.2 |
| t | 0.00 | Table | Meet 2.3.4 |
