Indian Bridal Fashion Jewellery Collection 15

Indian Fashion Bridal Jewellery Collection.

By AamirMannan.

REFRACTIVE INDEX AND ITS MEASUREMENT

The first task identifying a gemstones is to make quite sure to what mineral species it belongs: to determine, for instance, whether it is a corundum (ruby or supphire), a beryl (emerald or aquamarine), quartz (amethyst or citrine), topaz, tourmaline, spinal, peridot, or zircon.

Though one may often make a shrewd guess as to the nature of a stone by reason of its colour, lustre, and general appearance, it is often only by measuring one or other of its optical or physicals 'constants' that one can be really sure of once's ground.

In this chapter methods are described for measuring the most important of these constant.

Men is a profoundly lazy creature and its has been said that most of his inventions has been born of the urge to save himself trouble.

Presumably, therefor, jewellers who are not scientifically minded would welcome an apparatus which would enable stones to be identified in some really simple manners, quickly, clearly, and without calculations.

If, merely by placing the table facet of an unknown stones on an instrument, its name could be read off by mean of a pointer on a calibrated scale, one would expect such an apparatus to be widely popular.

Instrument closely corresponding to this 'ideal' have in fact been designed and marketed (at rather a high price) during recent years.