Emrald possess a double refractive character. It has a refractive index of 1.57-1.58 and its specific gravity is 2.7gm/cm. The color of this stone is green and various shades of green and is popular by the name of Panna or Markat.
The common sources of Emrald and Brazil, Russia, India and Colombia.
Emrald corresponds to the planet Mercury and is worn on a Wednesday.
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