ಸೂರ್ಯ remedies are kept on ರವಿವಾರ: chant ಹ್ರಾಂ ಹ್ರೀಂ ಹ್ರೌಂ ಸಃ ಸೂರ್ಯಾಯ ನಮಃ, donate ಗೇಹೂಂ, ಗುಡ಼, and keep the weekday fast. ಮಾಣಿಕ್ಯ is the graha's stone, but it should only be worn once ಸೂರ್ಯ has been established as a functional benefic for your lagna.
Surya remedies are for authority, vitality and the relationship with the father — the parts of life the Sun signifies. They are prescribed when the Sun is weak or afflicted in a chart, not as a general tonic; a strong Sun needs no strengthening.
The corpus describes an ill-placed Sun as low self-esteem, absent energy and confidence, and friction with authority and with the father. That is the pattern these practices address.
The mantra, the weekday fast and the charity are safe for anyone — they address ಸೂರ್ಯ without amplifying it. ಮಾಣಿಕ್ಯ is not: a planetary gem strengthens whatever the graha is already doing, so it needs a chart reading first.
ರವಿವಾರ. Fasting, charity and mantra japa for ಸೂರ್ಯ all belong to that day.
The classical Sankhya is 7,000 repetitions, completed over weeks rather than at once. Begin with one mala — 108 — a day and build up; sincerity matters more than arithmetic.
ಮಾಣಿಕ್ಯ should be avoided by ಮಕರ, ಕುಂಭ lagna, where the graha is a functional malefic and the stone amplifies exactly what you were trying to correct. Every lagna not listed as recommended needs the chart read first.