This is one gemstone that should not be worn unless specifically directed by a sound astrologer.

Blue sapphire brings mental peace and financial rewards to the afflicted person. It is the fastest working gemstone among the 9 planetary gemstones. It shows benefits within 3 seconds, 3 minutes, 3 hours or 3 days. 

If proven beneficial, it will resolve major problems, bestow mental peace, clarity of thought, freedom from depression and anxiety. It will cure depressive psychosis, physical ailments and even alcoholism. However, if it proves malefic, the adverse reactions could be anywhere between quarrels, accidents or financial problems. 

The wearer is sure to get dreams upon wearing the gemstone; judging by the quality of the dreams, one may decide whether to wear or discard the gemstone.