Diamond Brilliance 390

Cutting Diagram & Optical Specifications

Target Material

Quartz, Amethyst & Citrine

Refractive Index

RI 1.54 (Critical Angle 40.5°)

Cut Shape

Heptagon

Facet & Tier Count

71 facets · 11 tiers

Index Gear

84 index

Length / Width Ratio

1.03

Optical Optimization Score

0.869

Brightness & Contrast

0.84 / 0.90

Deliverable

Instant Printable PDF Cutting Instructions

Diamond Brilliance 390 is a meetpoint gemstone faceting pattern computationally optimized for Quartz, Amethyst & Citrine (RI 1.54) on a 84-tooth index gear. Download includes complete tier-by-tier pavilion, girdle, and crown cutting angles, index numbers, and meetpoint diagrams.