✦ GemologyUpdated: September 2, 2026

Diamond Alternatives Compared: Optical Brilliance, Fire Dispersion & Thermal Conductivity

By Artisanal Silversmithing & Gemology Review Board

A gemological comparison: Cubic Zirconia (CZ), Silicon Carbide (Moissanite), and Chemical Vapor Deposition (CVD) Lab Diamonds evaluated on refractive index, fire, and durability.

Modern synthetic gemology offers exquisite diamond alternatives ranging from accessible cubic zirconia to high-brilliance silicon carbide moissanite and chemically identical lab diamonds.

1. Optical & Physical Benchmarks

Stone Material	Mohs Hardness	Refractive Index (Brilliance)	Fire Dispersion (Rainbow Sparkle)
Natural / Lab Diamond (C)	10.0	2.417	0.044 (Crisp white brilliance)
Moissanite (SiC)	9.25 – 9.50	2.650 – 2.691 (Higher than diamond)	0.104 (2.4x higher rainbow fire)
Cubic Zirconia (ZrO2)	8.50	2.150 – 2.180	0.058–0.066 (High dispersion; softer crystal)

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Artisanal Silversmithing & Gemology Review Board

Our editorial panel inspects solid 925 sterling silver hallmarking fineness, GIA colored gemstone grading standards, anti-tarnish rhodium plating tolerances, and ethical lost-wax casting metallurgy.

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