The Portugese Cut
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| The Portugese Cut GemCad Derived Rendering by Bob Keller bkeller@rockhounds.com | |
|---|---|
| Angles for R.I. = 1.54 | 161 facets + 16 facets on girdle = 177 |
| 16-fold, mirror image symmetry | 96 index |
| L/W = 1.000 T/W = 0.434 T/L = 0.434 P/W = 0.585 C/W = 0.222 | H/W = (P+C)/W+0.02 = 0.827 P/H = 0.707 C/H = 0.268 |
| Vol./W^3 = 0.307 | Brightness at 0 degrees tilt for R.I. = 1.54 COS = 48.5{6303d0458f78485017e3ff509f07809060e27c7680a1c87bf8e331bc046fca94} ISO = 52.5{6303d0458f78485017e3ff509f07809060e27c7680a1c87bf8e331bc046fca94} |
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| Pavilion | |||
|---|---|---|---|
| g | 90.00 | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | Cut to equal depth, establish size |
| p1 | 62.00 | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | Meet g |
| p2 | 57.00 | 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 | Meet g,p1 |
| p3 | 52.00 | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | Meet p1,p2 |
| p4 | 47.00 | 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 | Meet p2,p3 |
| p5 | 42.00 | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | Meet p3,p4 and at culet |
| Crown | |||
| c1 | 46.00 | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | Meet g, cut level upper girdle line |
| c2 | 41.00 | 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 | meet g,c1 |
| c3 | 36.00 | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | Meet c1,c2 |
| c4 | 31.00 | 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 | Meet c2,c3 |
| c5 | 26.00 | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | Meet c3,c4 |
| t | 0.00 | Table | Meet c4,c5 |
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