DCA Gemology Practice Test 2026 – Comprehensive Exam Preparation

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How does moissanite's dispersion compare with diamond, and what effect does that have on appearance?

Moissanite dispersion is identical to diamond.

Moissanite has higher dispersion, yielding more pronounced fire than diamond.

Dispersion is how a gemstone spreads white light into its component colors. Moissanite splits light more than diamond, so it creates stronger color separation as light exits the stone. That results in more pronounced fire—those vivid rainbow flashes—especially in bright light and with well-cut facets. So the brighter, more colorful sparkle you see in moissanite compared to diamond comes from its higher dispersion.

Moissanite has lower dispersion than diamond.

Moissanite does not show dispersion.

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