Product may slightly vary from picture . The gemstone ruby (Manik or Manikeya in Hindi) is the red variety of the mineral Corundum, the second hardest natural mineral known to mankind. Ruby is the July birthstone, and the Capricorn Zodiac stone. Ruby has been associated with the values of love, success, integrity, passion, and promise. All colors of corundum other than red or white are called Sapphire The red color in ruby is caused by trace amounts of the element chromium.