Ruby Stone Online, Ruby (Manik) Gemstone Price, Ruby Stone ... Ruby is a precious red variety of Corundum mineral. This red stone rates 9 on the Mohs hardness scale. Ruby (called manik or manikya in hindi) represents the astrological planet Sun as per Indian Vedic astrology. The sun is considered to be of utmost importance in astrology and has the place of father/king in a horoscope.