The 9 Jyotish Gemstones
Vedic astrology deals with seven visible planets and two invisible ones:
the Sun, the Moon, Mars, Mercury, Jupiter, Venus and Saturn, along with the two lunar nodes, Rahu (ascending lunar node) and Ketu (descending lunar node). These nodes are the two intersecting points of the solar and lunar planes as seen from the earth.
Nine gemstones are associated with these planets. Associated with the Sun is the RUBY, with the Moon is the PEARL, with Mars is the RED CORAL, with Mercury the EMERALD, with Jupiter is the YELLOW SAPPHIRE, with Venus is the DIAMOND (we like to use unheated WHITE SAPPHIRES instead or some other alternative gems vs. the very costly, clean white diamonds), with Saturn the BLUE SAPPHIRE, with Rahu the HESSONITE GARNET, and with Ketu is the CAT'S EYE CHRYSOBERYL.
Associated with the nine planets are also the days of the week, different parts of the human body and different metals.