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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 is greater 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 synthetic strontium titanate and also by such coloured stones as demantoid (green garnet), and sphene.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson