Gemstone therapy is a part of astrology. Nine main gems are used in astrology for each planet :-

1. For the sun planet- ruby stone. It balances and enhances the positive
effects of the sun planet. Sun is the natural significator of father, son, soul, power, authority, govt. and many more things.

2. For the Moon planet -pearl (moti). It balances the effects of the moon planet. Moon is a natural significator of mother, mind, emotions, and many more things.
3. For the jupiter planet - yellow sapphire (pukhraj). It balances and enhances the positive effects of jupiter planet. jupiter is a natural significator of teacher, guru, blessings, knowledge, wisdom, insights etc and many more things.
4. For the venus planet - diamond /opal. It balances and enhance the effects of venus planet. Venus planet is a natural significator of wife, beauty, luxury, vehicles etc, and many more things.

5. For the mercury planet - emerld (panna). It balances and enhances the effects of mercury planet. Mercury is a natural significator for intellect, communication, memory, education etc., and many more things.

6. For the mars planet - coral(moonga). It balances the effects of mars planet. Mars is a natural Significator for energy, action, property, etc, and many more things.
7. For saturn planet - blue sapphire (Neelam). It balances and enhances the effects of saturn. Saturn is a natural significator of karma, service, hard work, etc., and many more things.

8. For Rahu planet -Hessonite(gomed). It balances the effects of the Rahu planet. Rahu is a natural significator for foreign, huge things, etc and many more things.
9. For ketu Planet - cat's eye (lehsunia). Its balance effects of Ketu planet. Ketu is a natural significator for spirituality, mysticism, etc., and many more things.

Note: According to the horoscope of the person and particular concern of the person gemstone is recommended to them.