A six-pointed diamond, pure, without stain, with pronounced and sharp edges, of a beautiful shade, light, with well-formed facets, without defects, illuminating space with its fire and with the reflection of the rainbow, a diamond of this kind is not easy to find in the earth. According to a wide-spread superstition, the talismanic power of a diamond was lost if the stone were acquired by purchase; only when received as a gift could its virtues be depended on.[83] The same belief is noted regarding the turquoise. The spirit dwelling in the stone was thought to take offence at the idea of being bought and sold, and was supposed to depart from the stone, leaving it nothing more than a bit of senseless matter. If, however, the diamond (or turquoise) were offered as a pledge of love or friendship, the spirit was quite willing to transfer its good offices from one owner to another. The Talmud shows us that the Jewish Rabbis sometimes endeavored to enliven their exhaustive discussions of ritual and legal questions by telling “good stories” to each other. One of these may be given as illustrating at once the wild improbability of some of these recitals and the belief in the wonderful magic virtues of the diamond:[84] R. Jehudah of Mesopatamia used to tell: Once while on board of a ship, I saw a diamond that was encircled by a snake, and a diver went to catch it. The snake then opened its mouth, threatening to swallow the ship. Then a raven came, bit off its head, and all water around turned into blood. Then another snake came, took the diamond, put it in the carcass, and it became alive; and again it opened its mouth, in order to swallow the ship. Another bird then came, bit off its head, took the diamond and threw it on the ship. We had with us salted birds, and we wanted to try whether the diamond would bring them to life, so we placed the gem on them, and they became animated and flew away with the gem. It is said that the first large diamonds discovered by Europeans in South Africa were found in the leather bag of a sorcerer. Although large stones or fragments of rock are usually the objects of adoration as fetiches in Africa, any small stone that is wrapped in colored rags and worn on the neck may be regarded in the same way.[85] Several competent authorities state that these diamonds were the playthings of some Boer children. Al Kazwini relates as follows the marvellous tale of the Valley of Diamonds:[86]