Black Jade is used in Daoist Stone Medicine to promote the virtue of clarity.  It’s black color represents all possibilities.  Through working with Black Jade we’re inspired to keep the faith.  Out of darkness comes light.  
Black Jade is also a protective stone, owing to the presence of the Black Vibration, which gives it the ability to absorb detrimental vibrations, when instructed by the user.  Make sure to clear Black Jade often under running water, preferably a clean, natural source, such as a creek, as it easily absorbs these vibrations.
Black Jade also contains the powerful vibration of Negative Green, which acts as a spiritual carrier wave allowing the user to access wisdom from higher planes of nature.
Whether you are seeking spiritual protection or spiritual wisdom, Black Jade is a good choice for either application.