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Indigo Starburst 678
Truncated Heptagon Corundum (Sapphire & Ruby) Faceting Diagram · Optimized for RI 1.76 · 84 Index Gear
Cutting Diagram & Optical Specifications
- Target Material
- Corundum (Sapphire & Ruby)
- Refractive Index
- RI 1.76 (Critical Angle 34.6°)
- Cut Shape
- Truncated Heptagon
- Facet & Tier Count
- 50 facets · 8 tiers
- Index Gear
- 84 index
- Length / Width Ratio
- 1.03
- Optical Optimization Score
- 0.919
- Brightness & Contrast
- 1.07 / 0.89
- Deliverable
- Instant Printable PDF Cutting Instructions
Indigo Starburst 678 is a meetpoint gemstone faceting pattern computationally optimized for Corundum (Sapphire & Ruby) (RI 1.76) on a 84-tooth index gear. Download includes complete tier-by-tier pavilion, girdle, and crown cutting angles, index numbers, and meetpoint diagrams.