Aries is ruled by the planet Mars. The primary gemstones for Aries ascendants in Vedic Astrology are red coral, ruby, yellow sapphire, and pearl.
Red coral is the gemstone for Mars, the ruling planet of an Aries rising. It rules over the 1st house (self, body) and the 8th house (transformation). Red coral is worn by Aries people who need a boost in motivation, courage, physical stamina, and energy. If there is an excess of physical heat in the body (or pitta in Ayurveda), red coral should not be too large in size, too dark red in color, or it should be worn with a pearl to keep things in physiological balance. Red coral is warming to the body and pearl is cooling.