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344        CURIOUS LORE OP PRECIOUS STONES
light emitted by this stone. It is not easy to determine the reason that induced the Hindus to dedicate the dia­mond to the planet Venus rather than to the Sun or to the Moon. However, as the most brilliant of the planets, Venus was not unworthy of the honor, and if we sub­stitute the Goddess of Love for her planet, it seems quite appropriate that she should be adorned with the most brilliant of precious stones. Certainly these sparkling gems are often enough offered at the shrine of Venus in our own day, and they often serve to win the good graces of the divinity to whom they are presented.
The Sanskrit name for the sapphire, nila, signifies "blue," so that, as the topaz is the "yellow stone" par excellence, the sapphire is the blue stone (nilaçman). In both cases the name indicates a variety of corundum, dis­tinguished merely by the coloring matter. As a talisman the Hindus believed that the sapphire rendered the planet Saturn favorable to the wearer, an important con­sideration from the astrological point of view, for Saturn's influence was generally supposed to be unfav­orable. The Hindus distinguished four classes of sapphires, corresponding to the four castes : Brahmins, Kshatriyas, Vaisyas, and Sudras. The respective sap­phires were light blue, reddish blue, yellowish blue, and dark blue. The same distinction is made in the case of the diamond, and a like rule applies to both stones, namely, that only the appropriate stone should be worn by the members of each caste, in order to profit by the virtues inherent in the sapphire or diamond.9
One of the Sanskrit appellations of the hyacinth (zircon) is râhuratna,—that is, the jewel dedicated to the mysterious "dragon," that was supposed to be the
" Garbe, " Die indische Mineralien,", Naharari's Kâjanighantu, Varga XIII, Leipzig, 1882, p. 83.