Carbuncle
The carbuncle was recommended as a heart stimulant; indeed, so powerful was its action, that the wearers were rendered angry and passionate and were even warned to be on their guard against attacks of apoplexy.[57] The blood-red hue of the stone also suggested its use as a symbol of the divine sacrifice of Christ on the cross. However, not only in Christianity was this stone used to illustrate religious conceptions, for the Koran affirms that the Fourth Heaven is composed of carbuncle. In mythical fancies too this stone played its part, for dragon’s eyes were said to be carbuncles.
Rumphius[58] states that in 1687 he was told by a chirurgeon that the latter had seen in the possession of one of the rulers in the island of Amboin a carbuncle said to have been brought by a serpent. The story ran that this ruler, when a child, had been placed by his mother in a hammock attached to two branches of a tree. While there a serpent crept up to him and dropped a stone upon his body. In gratitude for this gift the parents of the child fed and cared for the serpent. The stone is described as having been of a warm yellow hue, verging on red; it shone so brightly at night that a room could be illuminated by it. It eventually passed into the possession of a King of Siam.