Ruby Gemstone, or Manik Stone, is an extremely high-value crystal. It hails from the precious mineral clan corundum and is widely used for both fashion and astrological purposes. However, several times, these red crystals are heated or treated with chemicals in order to enhance color and clarity. While absolutely natural and unheated Rubies fetch more valuable in the market, heated rubies come at a lower cost but have no astrological significance. So if you also planning to buy this auspicious stone, then make sure to buy a GIA-certified Ruby. It is among the most trusted gem testing labs in the world and its authenticity certificate provides you the assurance regarding its color, origin, treatment, and genuineness.