Zircon crystals from Ceylon have long been known to gemmologists for their abundance and high quality as semiprecious stones. Because of extraordinary variations in physical properties, such as the indices of refraction and density, they have captured the attention of mineralogists for almost the last 100 years. However, very little is known regarding their age. Wadia and Fernando (1944) suggest a pre-Cambrian age for the pegmatites from which the zircon of the gem-bearing gravels is believed to have been derived.

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