There is a belief that some particular crystals have extraordinary energies that can affect our physical and mental health. The following are some of the crystals usually believed to have positive impacts on human health; clear quartz, jasper, obsidian, amethyst, and bloodstone. Despite lack of complete scientific proof for these beliefs, many people take solace in incorporating these stones as jewelry into their daily lives.  Crystals have been worn long before science was even a field of study.