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Ch. 8: Diamond - Physical and Chemical Properties

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DIAMONDS
ascribes this band to an impurity and suggests it may possibly be due to samarium.' Three other fainter lines were detected in the ultra-violet by means of photography.
Refractivity But it is not the hardness of the diamond so much as its optical qualities that make it so highly prized. It is one of the most refracting substances in nature, and it also has the highest reflecting properties. In the cutting of diamonds advantage is taken of these qualities. When cut as a brilliant the facets on the lower side are inclined so that light falls on them at an angle of 240 13', at which angle all the incident light is totally reflected. A wellcut brilliant should appear opaque by transmitted light except at a small spot in the middle where the table and culet are opposite. All the light falling on the front of the stone is reflected from the facets, and the light passing into the diamond is re102
Ch. 8: Diamond - Physical and Chemical Properties Page of 171 Ch. 8: Diamond - Physical and Chemical Properties
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