Emerald is a variety of the mineral beryl (Be₃Al₂(SiO₃)₆) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5–8 on the 10 point Mohs scale of mineral hardness. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.

Contents

• 1 Etymology
• 2 Properties determining value
  • 2.1 Color
  • 2.2 Clarity
  • 2.3 Treatments
• 3 Emerald localities
• 4 Synthetic emerald
• 5 Emerald in different cultures, and emerald lore
• 6 Notable emeralds
• 7 Gallery
• 8 See also
• 9 References
• 10 Further reading
• 11 External links

Adjective

emerald (comparative more emerald, superlative most emerald)

1. Of a rich green colour.

Noun

emerald (plural emeralds)

1. Any of various green gemstones, especially a green transparent form of beryl, highly valued as a precious stone.
2. emerald green

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