(Conversion: 2.5cm = 25mm = approx. 1″ inch) Personalise this pendant with your choice of Add On birthstone or charm. Gemstone pendants are packaged in a lovely randomly chosen gift pouch with a description card, ready to give or keep for yourself! Black onyx – can be used to banish grief, to enhance self-control, stimulate the power of wise decision making and encourage happiness and good fortune. It helps one to follow the path alone, promoting the recognition of personal strengths and assisting in the understanding of the reality of the moment. It helps one to become the master of one’s own future.