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Refractive Index 1.72 Critical Angle 35.5° Hardness 7.5–8 Mohs

Spinel & Garnet Faceting Diagrams

Recommended Rough: Red, pink, grey & cobalt spinel, rhodolite garnet, Malaya garnet, grossular/tsavorite

Spinel and pyralspite/grossular garnets (RI 1.72–1.74, critical angle 35.5°) are singly refractive favorites among precision cutters—rewarding well-tuned pavilion geometry with vivid, zero-doubling flash.

Darker garnet and spinel rough easily suffers from black extinction if pavilion angles trap light too deeply. Each RI 1.72 design here maximizes bright face-up return while keeping structured contrast patterns crisp.

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Top Spinel & Garnet Cutting Diagrams (RI 1.72)

Handpicked showcase renders and highest-scoring optical patterns for RI 1.72 rough.

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Other Gemstone Materials by Refractive Index

Sapphire & Ruby RI 1.76 Quartz & Amethyst RI 1.54 Beryl, Emerald & Aquamarine RI 1.58 Topaz & Tourmaline RI 1.61 Spinel & Garnet RI 1.72 Cubic Zirconia (CZ) RI 2.15 Diamond RI 2.42 Moissanite RI 2.67

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