We might want our benefics to be strong and our malefics to be weak. We talked about some general rules for knowing which grahas are benefics and malefics for a given horoscope here: Hindu Predictive Astrology: Lagna (janmalagna) or Ascendant – 1
grahAs are stronger when exalted or in their uccha rAs’Is. (See: Uccha, Neecha, Exaltation, Debilitation). All of us know that on a given day the sun is highest at noon. But even at noon, the sun is highest or exalted when it is in Aries. Each graha has its uccha and neeca points in different rAs’Is.
Let us say that ravi is your benefic, then it will be great if he is in mESa in your jAtaka cakra.
With regard to gem-stones: some suggest you strengthen the benefics and some suggest you appease the malefics. Some suggest wearing them and some suggest gifting them. You need to test it out for yourself and see if anything helps you.
|graha||uccha rAs’i||neeca rAs’i|