Cobalt Crown 910

Cutting Diagram & Optical Specifications

Target Material

Corundum (Sapphire & Ruby)

Refractive Index

RI 1.76 (Critical Angle 34.6°)

Cut Shape

Truncated Cushion Pentagon

Facet & Tier Count

86 facets · 11 tiers

Index Gear

120 index

Length / Width Ratio

1.04

Optical Optimization Score

0.956

Brightness & Contrast

1.10 / 0.97

Deliverable

Instant Printable PDF Cutting Instructions

Cobalt Crown 910 is a meetpoint gemstone faceting pattern computationally optimized for Corundum (Sapphire & Ruby) (RI 1.76) on a 120-tooth index gear. Download includes complete tier-by-tier pavilion, girdle, and crown cutting angles, index numbers, and meetpoint diagrams.