Sparkly Dome Faceting Diagram: Precision Gem Cutting Guide by Marco Voltolini
The Sparkly dome is an extraordinary and brilliant 4-fold mirror-image symmetry cushion/dome faceting diagram created by master gem artist Marco Voltolini. Designed specifically for a standard 96-index gear, this cut delivers magnificent scintillation and light reflection, working wonderfully for Quartz family gemstones.
1. Design Overview & Suitable Gem Materials
Calculated for a baseline Refractive Index (R.I.) of 1.540, Sparkly dome is ideal for cutting Quartz (such as Smoky Quartz, Amethyst, and Citrine). The complex facet arrangement creates a dazzling dome-like light return that enhances stones with large tables.
2. Technical Design Specifications
- Design Name: Sparkly dome
- Designer: Marco Voltolini
- Required Index Gear: 96 Index Gear
- Optimized Refractive Index (RI): 1.540 (For Quartz)
- Facet Count: 81 Facets + 8 Girdle Facets = 89 Total Facets
- Symmetry Type: 4-fold, mirror-image symmetry
- Length-to-Width (L/W): 1.000
- Table-to-Width (T/W): 0.347
- U-to-Width (U/W): 0.347
- Pavilion Depth Ratio (P/W): 0.557
- Crown Height Ratio (C/W): 0.251
- Volume Ratio (Vol./W³): 0.378
3. Cutting Instructions & Angle Sequence
PAVILION CUTTING SEQUENCE
| Facet | Angle | Index Settings (96 Index) | Instruction |
|---|---|---|---|
| 1 | 45.53° | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | CTP (temp) |
| 2 | 90.00° | 96-24-48-72 | Set stone size |
| 3 | 90.00° | 12-36-60-84 | Cut corners... |
| 4 | 73.31° | 96-24-48-72 | Set girdle level |
| 5 | 43.15° | 03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 | Meet 1, 4 (only 8 facets have real meets) |
| 6 | 41.00° | 96-06-12-18-24-30-36-42-48-54-60-66-72-78-84-90 | Meet 1, 5. Final CTP |
CROWN CUTTING SEQUENCE
| Facet | Angle | Index Settings (96 Index) | Instruction |
|---|---|---|---|
| A | 47.64° | 96-24-48-72 | Set girdle thickness |
| B | 44.23° | 01-23-25-47-49-71-73-95 | Meet girdle |
| C | 26.00° | 02-22-26-46-50-70-74-94 | Meet A, B |
| D | 53.36° | 12-36-60-84 | Level girdle, meet C |
| E | 22.45° | 96-24-48-72 | Meet A, B, D |
| T | 0.00° | Table | Meet, D, E |
4. Practical Lapidary & Cutting Tips
- Quartz Optimization: This design is specially configured for quartz materials, ensuring wonderful internal brilliance and dispersion.
- Pavilion Steps: Pay close attention when executing the temporary CTP (Facet 1) and final CTP (Facet 6) to establish correct symmetry across all 89 facets.
- Crown Meets: Ensure precision when meeting facets A, B, and D to form clean crown intersections before cutting the table.
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