From ancient medicine men to modern day healers, the belief is that each gem has the power to influence a specific part of our physical or emotional well being. The light reflected off of the gem, placed on vital nerve points, are thought to be absorbed by the body, supplying it with healing power. There is no scientific data to prove this theory but the long history of this belief in many cultures from all over the world suggests credible evidence of various gemstone healing properties.

Source - Smithsonian Book of Gemstones 1998