Shelley, who saw the world illumined by the rainbow hues of poetic fancy, wrote of “diamond eyes,” “an emerald sky,” “the emerald heaven of trees,” “the sapphire ocean,” “sapphire-tinted skies,” “the sapphire floods of interstellar air,” and “the chrysolite of sunrise.” For some reason, he does not use the ruby, a favorite stone with many poets, and psychologists might find in this a proof that red appeals less strongly to the idealist than do the other colors. The principal literary sources for the talismanic and therapeutic virtues attributed to ornamental stones may be divided into several groups, at first more or less independent of each other, but combined to a greater or lesser extent by later writers. Pliny gives, sometimes rather grudgingly, a number of superstitions current in his time, but the Alexandrian literature of the second, third, and fourth Christian centuries provides a much richer field for these superstitions, as shown in the Orphic poem “Lithica,” the “Cyrianides,” attributed to Hermes Trismegistus, the little treatise “On Rivers,” which bore the name of Plutarch, and last, but not least, in the work by Damigeron, which purported to be written by an Arab king named Evax, and sent by him to Tiberius or Nero. The influence exerted by the legends surrounding the stones of the high priest’s breastplate, and those chosen as foundation stones for the New Jerusalem, will be treated of elsewhere. In the seventh, eighth, and ninth centuries, a new literature on this subject made its appearance, probably in Asia Minor. Some of the works were originally written in Syriac and later translated into Arabic. Others were composed in the latter language. This source was drawn upon for the production of the Lapidarium of Alfonso X, of Castile. This compilation, although dating in its present Spanish form from the thirteenth century, is based upon a much older original in “Chaldee” (Syriac?). There can be little doubt that many Hindu superstitions, no longer preserved for us in the literature of India, are reproduced in these Syrio-Arabic works, wherein we have also much that is of Alexandrian origin. This indeed is easily explained by history, for the Arabs, through their widely extended conquests, were led to absorb and amalgamate the data they secured, directly or indirectly, from the East and the West.