The brilliant display of flashes of prismatic hues in certain gemstones due to a high dispersive power and a high refractive index, emphasized by faceting. The fire in a correctly faceted diamond isgreater than in other natural colourless gemstone (next is zircon), owing to the high dispersive power combined with its high refractive index; but it is surpassed by synthetic rutile and syntheticstrontium titanate and also by such coloured stones as demantoid (green garnet), and sphene.Such stones as theemerald,ruby, andsapphire, although they may have brilliance, do not have fire.
Fire
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Explanation on fire by Adin antique jewelry
Adin Academy
Fire
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The brilliant display of flashes of prismatic hues in certain gemstones due to a high dispersive power and a high refractive index, emphasized by faceting. The fire in a correctly faceted diamond isgreater than in other natural colourless gemstone (next is zircon), owing to the high dispersive power combined with its high refractive index; but it is surpassed by synthetic rutile and syntheticstrontium titanate and also by such coloured stones as demantoid (green garnet), and sphene.Such stones as theemerald,ruby, andsapphire, although they may have brilliance, do not have fire.
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References
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson
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