When working with low refractive index materials like Amethyst or Citrine, achieving dynamic color movement without windowing requires precision geometry[span_2](start_span)[span_2](end_span). This bar-style step cut is specially engineered to maximize contrast and light reflection in Quartz and dark Tourmalines[span_3](start_span)[span_3](end_span).
Design Specifications
| Parameter | Specification Details |
|---|---|
| Target RI | R.I. = 1.540 (Quartz, Amethyst, Citrine)[span_4](start_span)[span_4](end_span) |
| Facet Count | 15 facets + 8 girdles = 23 facets total[span_5](start_span)[span_5](end_span) |
| Symmetry & Gear Index | 2-fold mirror-image symmetry | 96 Index Gear[span_6](start_span)[span_6](end_span) |
| Proportions | L/W = 1.000 | T/W = 0.919 | U/W = 0.189 | P/W = 0.489 | C/W = 0.205[span_7](start_span)[span_7](end_span) |
| Volume Ratio | Vol./W³ = 0.389[span_8](start_span)[span_8](end_span) |
Cutting Sequence & Angles
1. Pavilion Sequence
| Facet | Angle | 96-Index Settings | Instruction |
|---|---|---|---|
| 1 | 90.00° | 96-24-48-72 | Set stone size[span_9](start_span)[span_9](end_span) |
| 2 | 47.50° | 96-48 | Cut three steps equally spaced[span_10](start_span)[span_10](end_span) |
| 3 | 44.50° | 96-48 | Step facet[span_11](start_span)[span_11](end_span) |
| 4 | 41.00° | 96-48 | Step facet[span_12](start_span)[span_12](end_span) |
| 5 | 69.67° | 24-72 | Meet 1, 2[span_13](start_span)[span_13](end_span) |
| 6 | 90.00° | 12-36-60-84 | Nick corners (optional for big stones)[span_14](start_span)[span_14](end_span) |
2. Crown Sequence
| Facet | Angle | 96-Index Settings | Instruction |
|---|---|---|---|
| A | 78.89° | 96-48 | Set girdle thickness[span_15](start_span)[span_15](end_span) |
| B | 34.00° | 24-72 | Cut equal steps[span_16](start_span)[span_16](end_span) |
| C | 18.10° | 24-72 | Step facet[span_17](start_span)[span_17](end_span) |
| D (Table) | 0.00° | Table | Table facet[span_18](start_span)[span_18](end_span) |
Material Recommendations
This pattern is tested and proven for Quartz (RI 1.540)[span_19](start_span)[span_19](end_span). It is also an exceptional design choice for Tourmalines with a dark C-axis, as the step structure helps control and enhance light absorption[span_20](start_span)[span_20](end_span).
0 Comments