Black Onyx is the anniversary gemstone for the 10th year of marriage. Onyx is a variety of the microcrystalline quartz, called chalcedony. The name “chalcedony” comes from Calcedon or Calchedon, an ancient port on the Sea of Marmara in Asia Minor.
It is believed that onyx is a powerful protection stone, Black Onyx absorbs and transforms negative energy, and helps to prevent the drain of personal energy. Black Onyx aids the development of emotional and physical strength and stamina, especially when support is needed during times of stress, confusion or grief.
Cleaning onyx jewelry is pretty straightforward: Just use a soft, dry cloth or a soft brush to wipe any dirt off your gemstones. You can also use a little water to moisten the cloth and make the cleaning easier. Don't wet the stone or soak it in water, however, as onyx is porous and absorbs liquids easily.