After stating that the emerald sharpens the wits and quickens the intelligence, Cardano declares that it therefore made people more honest, for “dishonesty is nothing but ignorance, stupidity, and ill-nature.” The same writer adds that the stone was believed to make men economical and hence to make them rich, but of this he was very sceptical, since the experience of others as well as his own showed that the emerald possessed very little power in this direction.[95] A talismanic emerald, once the property of the Mogul emperors of Delhi, has recently been shown in Europe. The stone is of a rich deep green, and weighs 78 carats. Around the edge in Persian characters runs the inscription: “He who possesses this charm shall enjoy the special protection of God.” Emerald sharpened the wits, conferred riches and the power to predict future events. To evolve this latter virtue it must be put under the tongue. It also strengthened the memory. The light-colored stones were esteemed the best and legend told that they were brought from the “nests of griffons.”[96] Gypsum Gypsum when fibrous—the fibres being long and straight—is known as “satin spar.” This material is frequently cut rounded, or _en cabochon_, across the fibres; sometimes it is cut in the form of beads, or of pear-shaped drops, which are mounted in ear-rings, scarf-pins, or necklaces. The material is frequently found in Russia, England, and elsewhere, and is cut in England or Russia. Some of the cut stones are mounted in brass, or gilded brass, and sold as luck stones at Niagara, the claim being made that the “satin spar” was taken from beneath the Falls at great peril, as occasionally small deposits of this kind of gypsum are found under the Falls. From time to time small consignments of this material have been sent to Japan, as the Japanese value it possibly on account of its purity, or owing to the fact that it has the effect of the cat’s-eye. It is quite cheap, and at the same time very soft, so that it can be scratched with the finger-nail. That found in Russia is of a golden-yellow or salmon color, and is worked into various ornaments, the one popular form being egg-shaped, and, because of their form, such objects are frequently given as Easter gifts. The same material is also known in Egypt, and is cut in the same egg form, the ornaments being called “Pharaoh’s eggs,” although just which Pharaoh this refers to is not stated. They are also believed to possess qualities of protection and to bring good fortune. Hematite