Coral rosaries are less commonly mentioned in Vedic texts compared to rosaries made from Rudraksha, Tulsi, or crystal. However, coral is generally associated with the planet Mars and considered to carry energy related to strength, courage, vitality, and passion.
A coral mala can be used in practices relating to deities that embody similar qualities. It can also be used in mantras dedicated to deities like Hanuman or the various forms of Shakti, who represent strength, power, and energy. In certain specific scenarios, coral japa malas are also used for chanting Lord Ganesh and Ma Laxmi mantras.
Details of japa mantras will ofcourse vary according to personal beliefs, sect, and/or spiritual tradition.
However, it should be noted that preferences for certain materials in malas can vary widely, and different sources may offer conflicting information. Consulting with a knowledgeable guru, priest, or spiritual guide who is familiar with your specific tradition would be the best way to determine the most appropriate use for a coral mala in your personal practice.