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  : Gemstone Brilliance and Fire
Frequently Asked Questions (FAQ) / Most Brilliance and Fire

Which gems have the most brilliance and fire?

Among the well-known colored gems, those with the greatest brilliance and dispersion (fire) include diamond, zircon, sphene, sphalerite, demantoid garnet, spessartite garnet, sapphire and tanzanite. For more detailed rankings, see our refractive index chart and our dispersion chart.

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  • First Published: February-20-2006
  • Last Updated: March-22-2017
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart