PEARL

The ruling planet of this Gem/Stone is MOON (Monday)
What you have to do:-
Donate - Pearl or moonstone, silver, water, cow`s milk or white rice to a female on Monday evening.
Fasting - On Mondays, especially during Moon transits and major or minor Moon periods.
Mantra - "Aum sean srim sraum sah chandraya namah." To be chanted on Monday evening, especially, during major or minor Moon periods.
This will help pleading Moon (Chandra) and increasing mental health and peace of mind.