Vidruma or coral is an organic gem that comes from reefs and atolls.  The most valued coral is the noble red coral seen here (Corallicum rubrum).  The color is uniform throughout with no pits or color streaks.  Polished coral has a vitreous lustre.   Due to pollution, coral is an endangered species.
Vidruma or coral influences Mangal or Mars which is responible for the field of activity, energy, courage, ambition, sports, property, strength, commander, technical ability, mechanical, forcefulness and bravery.  In Jyotish, Mangal is known as the commander-in-chief, due to its influence in organizing and managing direction in activity.  Mangal or Mars is like a general with its focus on precision and power in activity. Mangal in our physiolgy is associated with the Red Nucleus, Pars Compacta, and Amygdala. These structures in the brain control activity by providing checks and balances, activating and inhibiting impulses in the brain, and maintaining steadiness and precision of movement.  These influences can be strengthened with the wearing of Vidruma or coral when recommended.