Basically a green variety of Beryl, not all gem quality green beryl are called Emerald. Emerald is of ancient origin. This is a very rare, radiant, and beautiful gemstone. Stones of fine colour, weighing from 2 carats, are among highly valued gems. Emeralds are fascinating gemstones. They show the most beautiful, deepest and most brilliant green imaginable: Emerald green. Emerald are even more valuable than diamonds.The name Emerald was derived from French "esmeraude" which in turn goes back via Latin to the Greek root "smaragdos", meaning simply "green gemstone".
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