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Ch. 8: Properties and Tests Diamonds Diamonds

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	PROPERTIES AND TESTS FOR DIAMONDS very high index of refraction for diamond, 2.42, gives its extraordinary brilliancy.



	The rose and brilliant are standard shapes of diamonds. The reflected light is refracted into a wonderful play of "lightning flashes", and "sparkling scintillations" as it passes into the air. The somewhat general idea that the quality of shining in the dark is common to all diamonds is an error founded on the statement by careless educators, of the truth, that some do. Experiments show that very few diamonds, either by exposure to sunlight or rubbing, will show any light in a dark room. Color is one of the most important qualities of diamond. Generally, "fine color" means the absence of color, or pure, clean, colorless, transparency. Tints of pink and blue are considered extra fine. So also fine color sometimes means a rich or rare color as the term is usually applied, as pink, blue, and yellow. Almost all gems conceal their true beauties in a natural 73

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