- Emerald is any of the various green gemstones, especially a green transparent form of beryl, highly valued as a precious stone. Emeralds come in many shades of green and bluish green. There is a wide spectrum of clarity, dependent on the inclusions and fractures in the crystal. Clear stones with dark yet vibrant color command the highest prices. Almost all emeralds contain numerous flaws, cracks, and inclusions, which can negatively affect the clarity. Emerald is the birthstone associated with May.
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