Gems for the Sun should usually not be worn if the individual suffers from fever, bleeding, ulcers, hypertension, or infectious disease (high pitta). Psychological indications are excess ambition, seeking of power, a dominating nature, a strong ego, pride, or vanity.

Astrological factors are when the Sun is the lord of malefic houses (like the third, sixth and eleventh). We should be careful wearing gems for the Sun when benefic planets in the chart, like the Moon, Venus, Mercury, or Jupiter are in combust (close conjunction), or in strong aspect (opposition) to it.