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Welcome to our extensive antique jewelry glossary with around 1,500 jewelry related entries.If you feel you are missing an explanation, feel free to let us know and we will add it.
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