A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v2.c32.s16.28

v2.c32.s16.28

"The hardness of diamond has often been confused with its frangibility or brittleness. It has been supposed, especially in ancient and mediæval times that hammer and anvil may be shattered but the diamond which lies between. This statement was 3. LUSTRE, TRANSPARENCY, COLOUR and other optical properties. Difference in lustre (स्नेहप्रभेद) is often regarded as a diagnostic feature of the gems. According to Varāha gems of superior qualities should possess cool (lit. waxy) lustre, be limpid and emit rich rays. Classification according to colour is often enjoined. For instance, a diamond may be perfectly colourless, or it may be yellow,