Topaz is said to enhance one's spiritual potential, to increase inteligence and creativity, and to impart wisdom (and wealth!). It also is said to aid in meditation and in the manifestation of the desired outcome. It is also said to facilitate working with other minerals, enhancing the results.
Topaz is said to be strong healing and rejuvenating mineral, giving new vitality and good health, and protection against many diseases.
In addition to the above metaphysical properties for topaz, Blue topaz is said to enhance one's communicative abilities, helping to more easily and clearly express oneself.