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