According to Vedic Astrology, benefic or malefic planets show its result during Madasha, Antardasha and transit. The result so given by the planets depend upon the strength of planets posited in the horoscopes. If a planet is weak in the chart, the result pertaining to that planet or house will also be correspondingly weak even though that planet may be strong or exalted during transit.
Apart from these, Gem Stones are considered a powerful tool in Astrology to give power to the weak planets which otherwise are beneficial in the horoscopes. Each planet has Gem Stone of its own according to colour and the capacity of the gem to attract the cosmic rays of that particular planet in it.
Gems were so popular in ancient times that the kings used to wear them on their person and also in the crowns with the belief that gems would also attract wealth and prosperity apart from protection from the malefic planets.
Gems look very smooth by touch and attractive to eyes. To get the maximum benefit from the gems, these are cut in proper shape by the experienced jewelers. In Ayurveda, Gems are given special importance because these are commonly used to treat certain diseases. Bhasma or the ash of that particular gem is prepared through special process and used in Ayurveda to cure even some serious diseases.
We can say that Gems are not only attractive but these also have metaphysical, optical, healing and cosmic properties powerful enough to strengthen the weak planet in a horoscope. Gems should also be energized with specified mantras etc before wearing so as to give maximum benefits to the wearer. Read my articles on GEMS.