“Dante very happily introduces this precious stone, considering its properties, and considering that griffins watch over emeralds. The emerald is the prince of all green stones; no gem nor herb has greater greenness; it reflects an image like a mirror; increases wealth; is useful in litigation and to orators; is good for convulsions and epilepsy; preserves and strengthens the sight; restrains lust; restores memory; is powerful against phantoms and demons; calms tempests; stanches blood, and is useful to soothsayers.”