Lacquered October Opal Colored Rose with Gold Trim October BirthstoneBirthstone Month: October Opal Opals are associated with light and magic because of the unique variety of colors within them. Some believed that opals could make the wearer invisible. Necklaces with opals set in them were also worn to repel evil and to protect one's eyesight. Many cultures described opals as supernatural, able to guard against disease and give the gift of prophecy. Those born in October are protective, faithful, and loyal to those