Emerald Stone ('Panna Stone' in Hindi) is a beautiful green shade to colorless gemstone variety of the mineral Beryl. Panna Stone is gemstone with a Mohs index of 7.5-8 and specific gravity average 2.76. It is mined in India , Columbia (Columbian), Zambia (Zambian) and a few other countries (see: Emerald Stone Properties)

In Western Astrology, Emerald Stone is the birthstone for Taurus (21 April - 20 May). In Indian Astrology, panna stone strengthens Mercury ('Para grah') and is hence, the rashi ratna for Gemini ('Mithuna'). (refer: Emerald Gemstone Benefits)

For astrological purpose, Columbian Emerald and Zambian Emerald Stone are considered best and should preferably be worn in Gold or Panchdhatu (we recommend a higher quality precious stone as opposed to spending money on Gold, if budget is tight). An unheated and untreated panna stone with higher clarity, less internal inclusions, and pure colour is considered best for such purpose. Indian or Brazilian Emeralds can be chosen by those on a tight budget, but the quality is often far less than the Colombian and Zambian ones.

Green Tourmaline Stone, and Peridot Stone are considered astrological substitutes for Emerald Gemstone, but are said to have far less power.

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