queen, and, by her aid, to slay the king and gain possession of the kingdom. Although the legend does not expressly state that the ring was set with a stone, the use of the term “bezel” (σφενδόνη) suggests that some precious stone was the seat of the magic power the ring possessed. The traditions current at a later period with regard to the opal, which was reputed to render the wearer invisible, make it not improbable that, in the original legend, the ring of Gyges was represented to have been set with an opal, or rather perhaps with one of the rainbow-hued specimens of iridescent quartz. Plato may well have omitted this detail, for he was making a didactic use of the story and would naturally treat his material very freely. An old author conjectures that the stone set in the ring of Gyges was a serpent-stone from India. In that land brilliant and exceedingly beautiful stones were said to be found in the heads of certain crested snakes that abode in the mountains. If such a stone were set in a gold or silver ring, at the time when the planetary or stellar control of the stone was in the ascendant, the wearer of the ring was sure to have the fullest possible benefit from its powers.[475] The idea that serpents were endowed with supernatural wisdom was held by many ancient peoples, and in India legend assigned to these mysterious and dreaded reptiles the guardianship over diamonds, and also over the corundum gems, chief among which are the fair sapphire and the glowing ruby. The gold ring of Minos, King of Crete, although of course purely mythical, is usually ranked among the magic rings. It is said to have been used by the Cretan, who claimed Jupiter as his father, to test whether Neptune were really the father of Theseus. Taking his ring off his finger, Minos cast it into the sea, and commanded Theseus to bring it back to him, if the latter wished people to believe Neptune to be his father. He himself, Minos, could easily furnish proof of his descent from Jove by praying for a celestial sign. This he did, and immediately a loud thunder-clap resounded in the heavens. Not to be outdone, Theseus, not even stopping to make any supplication, threw himself into the sea to seek the ring. On this, there appeared a multitude of dolphins, and Theseus was softly borne away to the Nereides, who gave him the ring so that he might restore it to Minos.[476]