Navaratna is a specific arrangement of nine gemstones used in Indian astrology. This is also a Tantra of India. Gemstones Ruby, Pearl, Coral, Yellow Sapphire, Diamond, Blue Sapphire, Hessonite and Cat’s eye are arranged in a specific order to form the Tantra of Navaratna. Indian astrology uses this to get rid of bad affects of nine planets in human life and to enhance good effects of those nine planets. India is one of the oldest civilizations in the world.