OffTheDop
Refractive Index 1.61 Critical Angle 38.4° Hardness 7–8 Mohs

Topaz & Tourmaline Faceting Diagrams

Recommended Rough: Swiss & London blue topaz, imperial topaz, green & pink tourmaline, rubellite, indicolite

Sitting around RI 1.61–1.62 (critical angle ~38.4°), topaz and tourmaline offer noticeably crisper contrast and wider angular headroom than quartz—provided pavilion tiers respect dark c-axis absorption in tourmaline.

Whether you are cutting elongated tourmaline pencils or high-clarity blue and imperial topaz, these RI 1.61 diagrams are optimized for brisk scintillation, balanced table proportions, and forgiving meetpoint sequences.

Top Topaz & Tourmaline Cutting Diagrams (RI 1.61)

Handpicked showcase renders and highest-scoring optical patterns for RI 1.61 rough.

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Other Gemstone Materials by Refractive Index