1.)Strengthen your most auspicious planets first. With some exceptions, these are usually the rulers of the trikona (1st, 5th, and 9th) houses. If the planet is auspicious and well-placed, results from gemstones tend to be easy and straightforward. If the planet is auspicious but afflicted in the birth chart, gemstones help to neutralize and overcome the karma of those afflictions.
2.) A planet with predominant rulership of a dusthana, or inauspicious house (6th, 8th, or 12th) will usually produce challenging results when strengthened with gemstones. It’s best to chant mantras to appease malefic planets rather than wearing gems for them, or to neutralize their negative influence through remedial actions and conscious corrective behaviors in one’s day-to-day life.
3.) With some exceptions, planets with predominant rulership of mixed karma houses (2nd, 3rd, 7th, 11th) tend to produce mixed results when strengthened with gemstones, so caution is advised with these combinations. More dedication and mindfulness is required to navigate the effects of gems for maraka and upachaya (mixed karma) rulers than is needed for trikona (most auspicious) rulers.
4.) Wear only gems that are natural, top quality, as close to flawless as possible, properly cut, good color, and free of significant treatments.
5.) Don’t get too hung up on a suggested size or carat weight. The most important factor is always quality. Bigger gems are only more powerful if stones of equal quality are being compared.