Planetary Gemstone Theory
In Vedic astrology (Jyotish), each of the nine grahas, the Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn, Rahu, and Ketu, is traditionally paired with a specific gemstone believed to channel that planet's light and energy. A gem is generally recommended for a planet that is well placed or that rules a house the wearer wants to strengthen, such as the Lagna, career houses, or the 9th house of fortune.