History shows that the ancients had many beliefs and superstitions regarding rocks, colors and other things around them. They believed that each had a connection with their health, moods and events of the day. One of their beliefs was that chakra stones and other crystals had a direct effect on their health. Today, this has carried forward and parts of their beliefs have been proven valid.
For example, with the use of laboratory experiments it has been proved that color can affect a person's health. As a result, colors are being used, such as blue light in a mental ward, which is found to have a calming effect on the patients. High-powered infrared technology has also revealed a previously invisible spectrum around us showing that energy or heat that emits from the human body. In other words, there are things that are not apparent to the naked eye yet can affect one's everyday life.
The actual definition of the word chakra is that, according to yoga philosophy, it is any of a number of points of physical or spiritual energy in the human body. The belief is that when these 'chakra' get out of balance it causes problems and the crystals can restore that balance. The amount of these stones needed depends on each individual case.
The belief that they have the ability to favorably affect the body through energy vibrations, emitting from the stone, is held by many people. It is also believed that they affect various parts of the body and that they can provide vibrations that refresh and invigorate the body. Before being put to use they need to be cleared of any impurities and 'recharged'.
When they have been 'cleared', they are placed directly over the area affected. Eventually this vibration is felt which means the process has begun to work. The results are not immediate and they can only be used once a day, which means it may be a week or more before the effects are noticed.
It has long been known that there is a relationship between the human body and its surroundings, proven by the fact that scientific circles have show that energy or heat emits one's body but is invisible. Then it follows that other parts of our universe also have their own energy or heat, which can be beneficial when applied correctly. That is what happens with chakra stones. Their energy is absorbed into the body to replace the natural chakra that is missing or damaged.