Gem

Vedic Astrologes have found that every planet is in harmony with a certain type of primary Gem and secondary gem.  These have been shown below:

Planet                            Primary Gem                              Secondary Gem
Sun                                 Ruby                                             Red Spinel, Garnet
Moon                              Pearl                                             Moonstone
Mercury                          Emerald                                      Green Tourmaline, Peridot
Venus                            Diamond                                     White Sapphire
Mars                              Red Coral                                    Carnelian, Red Agate
Jupiter                           Yellow Sapphire                         Topaz
Saturn                           Blue Sapphire                             Lapis
North Node (Rahu)    Hessonite                                    Orange Zircon
South Node (Ketu)    Chrysoberyl                                  Cat's Eye, Crystals