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.