Black Onyx is one of the most popular stones on the market today. It is a fibrous opaque black quartz, a form of chalcedony. This gem is treated with a black dye to achieve a more uniform color, then polished to a brilliant luster. From the spiritual perspective, Black Onyx is associated with Saturn and is said that this stone works most positively for those born under the sign of Capricorn, but not limited to just them. It is believed to be one of the most powerful protection stones, absorbing and transforming negative energy. People have found it helpful in relieving stress and to assist with emotional stability. In India, it was commonly worn to cool the ardor's of love, helpful to those having a difficult time letting go of past relationships.