1) OM BRAAM BREEM BRAUM SAH BUDDHAI NAMAH
2) OM HVAM HLEEM BUM GREHANAATH BUDDHAI NAMAH
3) OM BUDDHAI NAMAH

Topaz: Topaz is the stone of Jupiter. Hence it should be worn on Thursday. On any Thursday at about 11 a.m. give a topaz-bearing ring a bath in Panchamrit or in raw milk and wash it in holy water of the Ganges. Put the ring then in the place of your worship and carry out usual worship rituals. Then pray Brihaspati and Lord Vishnu and wear the ring on the index finger of your right hand. Under some circumstances, it can be worn on the ring finger also. Topaz must necessarily be worn in gold. If you cannot afford gold, you can opt for silver as well. If it is Pushya Nakshatra on Thursday, it will be extremely auspicious conjugation for wearing Topaz. Topaz remains effective for more than four years.
HYMNS OF JUPITER (BRIHASPATI)

1) OM GRAM GREEM GRAUM SAH GURUVE NAMAH
2) OM AEM SHRI BRIHASPATYE NAMAH
3) OM BRIHASPATEY\GURUVE NAMAH

Diamond: Diamond is the main stone from Navratna category. It's a stone of Venus. Hence it is worn on any Friday. Time of 11 a.m. on any Friday during the darker phase of the month is the most auspicious moment for wearing diamond. First of all, wash the diamond ring with Panchamrit or raw milk, then with holy Ganges water. Worship the ring properly thereafter and recite the hymn of Venus (Shukra) 16,000 or 108 times. Then praying and begging pardon for any shortcoming in the rituals wear the ring on the ring or middle finger of your right hand. Diamond is specially beneficial in silver ring. It can also be worn in platinum ring but never in gold or other metals. Diamond remains effective for about seven years. If diamond is worn during Bharani, Purva Phalguni or Purva Sharh Nakshatra, it gives extremely beneficial results.
HYMNS OF VENUS

1) OM DRAM DREEM DRAUM SAH SHUKRAYA NAMAH
2) OM AEM JUM GEEM SHUKRAYA NAMAH
3) OM BRIGHU PUTRAYA NAMAH
4) OM SHUKRAYA NAMAH

Blue Sapphire: This is the stone of Saturn, hence it should be worn on Saturday. On any Saturday, during the darker phase at the time of 12 p.m. is the most auspicious for wearing blue sapphire. Wash the sapphire ring in Panchamrit or raw milk and then in holy water. Put it in the place of worship and carry out worship rituals properly. Recite the hymn of Saturn 23,000 or 108 times. Then praying and begging pardon for shortcomings committed, wear it on the middle finger of your right hand. Sapphire can be worn in gold, silver or steel but it is especially beneficial in an alloy of five metals.
HYMNS OF SATURN

1) OM PRAM PREEM PRAUM SAH SHANAYE NAMAH
2) OM HREEM AEM SHRI SHANAISHCHARAY NAMAH
3) OM NEELAANJANAY NAMAH
4) OM SHANAYE NAMAH

Gomed (Agate): This is the stone of Rahu. In astrology, Rahu is considered similar to Saturn in virtues, hence Agate is worn on any Saturday. Alternatively, it can also be worn on Wednesday or Friday. Time of 12 p.m. on any Saturday during the darker phase is considered as the most auspicious moment. Wash the ring in Panchamrit or raw milk and then in holy water and worship it properly. Thereafter, recite the hymn of Rahu 18,000 or 108 times. Praying and begging pardon then for any shortcomings committed, wear the ring on the middle finger of your right hand. Agate is specially beneficial in an alloy of five or eight metals. It can be worn in silver also. Agate remains effective for about three years. Swati, Shatabhisha or Aardra Nakshatras on Saturdays or Wednesdays are considered specially auspicious for wearing Agate.
HYMNS OF RAHU

1) OM BHRAAM BHREEM BHRAUM SAH RAHAVE NAMAH
2) OM KROM KREEM HUM HUM TUM TANK DHAARINE RAHAVE NAMAH
3) OM MAHA VEERYAY NAMAH
4) OM RAHAVE NAMAH

Cat's eye: This inexpensive but extremely effective stone is worn to please Ketu. It can be worn on Wednesday, Friday or Saturday. On any of these days during the darker phase of a month, evening time is the most auspicious moment for wearing Cat's eye. Wash it in Panchamrit or raw milk and then in holy water and worship it properly. Recite the hymn of Ketu 17,000 or 108 times. Then with devotional feelings, wear it on the little finger of your right hand. Cat's eye is beneficial only if worn in silver or an alloy of five metals. It remains effective for about three years. If it is worn during Ashwini Magha or Moola Nakshatra cat's eye proves especially beneficial.
HYMNS OF KETU

1) OM STRAAM STREEM STRAUM SAH KETUVE NAMAH
2) OM HREEM KREEM KROOM KRURRUPINYE KETUVE NAMAH
3) OM RAUDRA DEHAY NAMAH\OM KETUVE NAMAH

SOME OTHER CONDITIONS TO WEAR GEMSTONES

1) If the position of Sun is in the ascendant house or in the second, third, fourth, seventh, eleventh or twelfth house, ruby must be worn.

2) If the position of Moon is in the ascendant house or in the sixth, eighth, twelfth or in the Scorpio, one should wear pearl. If Moon is positioned with Rahu and Ketu or is retrograde or in setting position one should necessarily wear pearl.

3) If Mars is positioned with Rahu, Ketu or Saturn in the ascendant house or in the third, fourth, seventh, twelfth house one should wear coral. If it is present in the sixth, twelfth or eighth house with Moon or Sun, one should wear coral.

4) If Mercury is in sixth, eighth or twelfth house or in the Pisces with Rahu, Ketu, Saturn and Mars or is seen by them one should wear emerald.

5) If Jupiter is present in fifth, sixth, eighth or twelfth house or in Aries, Taurus, Leo, Libra, Capricorn, Aquarius and Scorpio, one should at once wear topaz.

6) If Venus is present in sixth, eighth house or is retrograde, weak, or seen by some sinister planet, one should wear diamond.

7) If Saturn is present in fourth, fifth, tenth or twelfth house with Sun or in the Aries or is retrograde or weak, one should immediately wear sapphire.

8) If Rahu is present in the ascendant house or in the third, fourth, ninth, tenth, eleventh or twelfth house or in Sagittarius seen by Sun, one should wear Agate.

9) If Ketu is present in the ascendant house or in the third, fourth, ninth, tenth, eleventh or twelfth house or in Sagittarius in conjugation with Mars, Sun, Jupiter or Venus, one should wear cat's eye.

Apart from these situations, stones of a particular planet are especially beneficial during Mahadasha\Antardasha period of that planet.