Every thing in this universe is composed of Seven Rays of colour. We can see these rays in Rainbow. We can say Meghadhanusha - VIBGYOR-rays. VIBGYOR rays means combination of Violet, Indigo, Blue, Green, Yellow, Orange & Red. Through a Prism one can find or see these cosmic rays. Ancient Indian text, the "Kurma Purana", the seven planets are to be seen as condensations of the seven cosmic rays. It was understood that on our planet Earth the greatest condensation of the cosmic rays is to be found in natural gem stones. Chart shows you the Ruling Planets, Primary Gems, & Zodiac Sign.

Zodiac Sign	Ruling Planet	Gems
Aries	Mars	Red coral, Garnet, Cornolian
Taurus	Venus	Diamond, White Zircon, White coral
Gemini	Mercury	Emerald
Cancer	Moon	Pearl, Moonstone
Leo	Sun	Ruby, Star Ruby, Garnet
Virgo	Mercury	Emerald
Libra	Venus	Diamond, White Zircon, White coral
Scorpio	Mars	Red coral, Garnet, Cornolian
Sagittarius	Jupiter	Topaz, Yellow Sapphire
Capricorn	Saturn	Blue Sapphire, Lapis Lazuli
Aquarius	Saturn	Blue Sapphire, Lapis Lazuli
Pisces	Jupiter	Topaz, Yellow Sapphire