If its luster dimmed, one knew his or her spouse had been unfaithful. Sapphire refused to shine when worn by the wicked or impure. As part of the customary fashioning process, virtually all blue, yellow and golden sapphires are heated to permanently produce or intensify their color. As with all gemstones, care should be taken to protect it from scratches and sharp blows. October - Opal Opal is the October birthstone as well as the accepted anniversary gemstone for the 14th year of marriage.
White opal has a white or light body color with flashes of many colors.
Black opal has a black, dark blue, dark green or gray body color with vivid flashes of color such as red, pink and bright green. Opal has symbolized hope, innocence and purity through the ages. In the Middle Ages, young, fair-haired girls wore opals in their hair to protect its lovely blond color. Medieval writers believed opal could render its wearer invisible when the need arose. It was also said to have a beneficial effect on eyesight.