Amethyst Arc 865

Cutting Diagram & Optical Specifications

Target Material

Spinel & Garnet (Rhodolite, Malaya, Pyrope)

Refractive Index

RI 1.72 (Critical Angle 35.5°)

Cut Shape

Truncated Cushion Pentagon

Facet & Tier Count

46 facets · 7 tiers

Index Gear

120 index

Length / Width Ratio

1.01

Optical Optimization Score

0.940

Brightness & Contrast

1.09 / 0.91

Deliverable

Instant Printable PDF Cutting Instructions

Amethyst Arc 865 is a meetpoint gemstone faceting pattern computationally optimized for Spinel & Garnet (Rhodolite, Malaya, Pyrope) (RI 1.72) on a 120-tooth index gear. Download includes complete tier-by-tier pavilion, girdle, and crown cutting angles, index numbers, and meetpoint diagrams.