The Hayek Cut For Gemstones
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The Hayek cut was named after the Nobel Laureate economist F. A. Hayek. Although this design was developed to fit a specific piece of beryl rough, the cut can be very useful for faceting other kinds of gems, too. Any time you have a blocky piece of rough that is not square enough for an emerald cut, try the Hayek.
This beauty has a Barion style pavilion, which accounts for its great brilliance. The optical performance of this cut is outstanding in light to medium colored rough. However, I would caution against using the Hayek cut in darker rough.
This is a fairly simple design to cut. Now that you have it in your repertoire, you should find multiple uses for this diagram.
The Hayek Cut: Diagrams
The Hayek Cut: Instructions
- Angles for R.I. = 1.56
- 45 facets + 4 facets on girdle = 49
- 96 index
- L/W = 1.500 T/W = 1.066 T/L = 0.710
- P/W = 0.807 C/W = 0.110
- H/W = (P+C)/W+0.02 = 0.937
- P/H = 0.862 C/H = 0.117
- Vol./W^3 = 0.628
Pavilion
| Step | Angle | Index | Notes |
|---|---|---|---|
| 1 | 43º | 96-06-12-18-24-30-36-4248-54-60-66-72-78-84-90 | Cut to temp center point (TCP) |
| 2 | 90º | 44-92 | Meet with step 3 at edge from step 1 |
| 3 | 90º | 24-72 | See step 2 |
| 4 | 75.5º | 24-72 | Meet at 1-2-3 |
| 5 | 75.5º | 44-92 | Meet at 1-2-3 |
| 6 | 42º | 09-57 | Add the mains last |
| 7 | 41.5º | 45-93 | |
| 8 | 41.4º | 33-81 | |
| 9 | 41º | 21-69 |
Crown
| Step | Angle | Index | Notes |
|---|---|---|---|
| a | 42º | 04-52 | Steps a to f meet at corners |
| b | 42º | 24-72 | |
| c | 30.7º | 25-73 | |
| d | 31.5º | 23-71 | |
| e | 32.2º | 05-53 | |
| f | 31.4º | 03-51 | |
| g | 25º | 04-52 | Meet e-a-f |
| h | 22.1º | 24-72 | Meet c-d-b |
| T | 0º | Table | Meet h-d-e-g and g-f-c-h |
