BHAGYA or LUCK is the most important factor that governs the success and status of a person. Astrology considers that BHAGYA is the outcome of the strength of certain planets in a native’s birth chart. To strengthen these planets Gems are used. Gems carry mysterious powers, which can affect one’s health, wealth and emotional well beings. All the planets have their own Gems. Gems are worn for drawing additional energy from the respective planets they represent so that the deficiency if any in the planetary rays at the time of birth is automatically rectified and a weak planet turns into a strong one. So if a planet is benefic but weak one should wear its gem in order to give it the required strength.
“Garud Purana” & “Indra Purana” have mentioned 9 primary Gems. In the Ratna Pareeksha Adhyay
(Ch.80) of Brihat Samhita of Varahamihira, it is mentioned that the kings wear auspicious Gems to ensure power and prosperity. While many scoff at the idea of gems exerting any influence over us, others have complete faith in this science.
It is true that Gems can enhance the strength of planets, provided we select the correct Gem. The example of Mr Amitabh Bachhan is in front of us who after being reduced to ashes once again have reached the pinnacle of success. Now days he is seen wearing 2 blue Sapphires, an Emerald. How strong a role did these stones play in his success?
Before wearing a Gem, one must get the Gem tested for its efficacy.  It is important to understand that the Gems can not give the desired effect unless they are genuine and have an auspicious AURA & INCLUSIONS. An enhancement in Gem, which is greatly prevalent in present times, mostly makes the Gem infertile and ineffective.
The intrinsic influence of the gems which is also called as the theory of science of the rays, has always been the subjects of the astrologers so often used for treatment of disease, fashion and assumed to be having spiritual power which gives good luck, mental peace and happiness.
The gems act as filter in the body of the human being. For example the ultraviolet rays of the sun are considered very dangerous for a human life. If a fellow puts on a piece of ruby, the ruby emits rays that prevent the ultra violet rays entering the human body directly. As a result the human circulatory system and its arteries and veins would function very well. This effect impacts on the sensory feelings.
The piece of ruby emits invariable rays which enter in the human body and affect his mind, brain and thought process. In consequence, it would flourish him in his personality and professional activities.In the Ratna Pareeksha adhyay of Vrihat samhita has mentioned that the kings wear favourable gems and jewels to insure the power and prosperity.
If they wore unfavorable gems, they get bad results. That is why it is said that before putting on a gem or a jewel, one must get adequately tested for its qualities and the defects and certain rituals need to be done before wearing the gems depending upon the horoscope.
How these gems are actually recommended and their specific effects are not found in any of these scriptural references. However, according to my Guru  one  should  always  wear  a  Gem  which  empowers  the  lords  of  the ascendant, fifth  and  ninth  houses .Because  these  are  the  points  of  Luck (bhagya)  and  it  is  amptly  said  that  “the  Lucky  takes  the  best  of  the  world-The  strong  and  the  very  knowledgeable  just  stand  and  watch.”