If you are searching for a striking, high-brilliance 6-fold gem design that delivers incredible light return for higher Refractive Index (RI) materials, the Fritillaria cut is an absolute masterpiece.
Designed specifically for gems like Garnet, Sapphire, Ruby (Corundum), and other high-RI rough, this design maximizes symmetry and flash while keeping facet alignment straightforward for precision gem cutters.
Fritillaria Design Overview & Specifications
| Parameter | Specification Details |
|---|---|
| Target RI | R.I. = 1.760 (Garnet, Corundum, Spessartite, etc.) |
| Facet Count | 43 facets + 12 girdles = 55 total facets |
| Symmetry & Gear Index | 6-fold, mirror-image symmetry | 96 Index Gear |
| Proportions (L/W, T/W, P/W, C/W) | L/W = 1.073 | T/W = 0.498 | U/W = 0.431 | P/W = 0.435 | C/W = 0.177 |
| Volume Ratio | Vol./W³ = 0.227 |
Step-by-Step Faceting Angles & Cutting Sequence
1. Pavilion Cutting Sequence
| Facet Step | Angle | 96-Index Settings | Instruction / Note |
|---|---|---|---|
| 1 (Pavilion Main) | 40.62° | 04-12-20-28-36-44-52-60-68-76-84-92 | Establish temporary centerpoint |
| 2 (Girdle) | 90.00° | 06-10-22-26-38-42-54-58-70-74-86-90 | Set overall stone size |
| 3 (Pavilion Break) | 39.00° | 96-16-32-48-64-80 | Meet girdle precisely |
2. Crown Cutting Sequence
| Facet Step | Angle | 96-Index Settings | Instruction / Note |
|---|---|---|---|
| A (Crown Main) | 51.14° | 08-24-40-56-72-88 | Set girdle thickness uniformly |
| B (Crown Break) | 25.00° | 02-14-18-30-34-46-50-62-66-78-82-94 | Meet girdle |
| C (Star Facets) | 17.43° | 08-24-40-56-72-88 | Meet facet A |
| D (Table Facet) | 0.00° | Table | Meet facet B |
Pro Cutting Tips for Maximum Brilliance
- Material Selection: This pattern shines best on high-RI rough like Garnet, Sapphire, Ruby, and Spinel. Avoid using Quartz (RI 1.54) with these exact angles, as it will cause central windowing.
- Pre-Forming Strategy: Keep your pre-form accurately aligned to 6-fold symmetry early on to ensure girdle meets remain clean and sharp.
- Table Alignment: Cut the flat Table (Facet D) slowly to avoid over-cutting into the delicate Star Facets (C).
Looking for more free faceting diagrams and precision gemology guides? Browse through our lapidary resources on Horizon Gems!
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