Astrological gems, especially when combined in nine-gem bangles (navaratnas), are a uniquely powerful way to mitigate and nullify the unfortunate effects of past wrong actions (negative karma). Astrological jewelry, whether in the form of bangles, rings, bracelets, or necklaces, when made and worn correctly, can potently benefit a person's psychological tendencies, physical health, business affairs and relationships, while helping to minimize the impact of a wide range of negative conditions and situations. Testimonials of people who have acquired astrological jewelry, (particularly nine-gem bangles) mention that the bangles help them improve concentration, lessen health problems, increase their focus on spiritual goals, professional direction and in most cases, assist their meditations. 
The gems' singular usefulness rests in their ease and efficiency; no will power or effort is needed by the wearer to receive the gem's ability to help counteract weakened planetary energies.