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Definition: emerald from The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

Clear, green gemstone variety of the mineral beryl. It occurs naturally in Colombia, the Ural Mountains in Russia, Zimbabwe, and Australia. The green colour is caused by the presence of the element chromium in the beryl.


Summary Article: emerald
from The Columbia Encyclopedia

the green variety of beryl, of which aquamarine is the blue variety. Chemically, it is a beryllium-aluminum silicate whose color is due to small quantities of chromium compounds. The emerald was highly esteemed in antiquity; the stones were used for ornaments in early Egypt where some of the first emeralds were mined. The finest emeralds are found in South America in Colombia, where they have been mined for over 400 years. The gem was a favorite in pre-Columbian Mexico and Peru, where it was cut in intricate designs. The treasure taken back to Spain by early explorers included emeralds. Good emeralds are the most highly valued of gem stones. Zambia and Brazil are also significant sources of the natural stones. Synthetic emeralds are also manufactured in Germany, France, and the United States. The Oriental emerald, a different gem, is the transparent green variety of corundum.

The Columbia Encyclopedia, © Columbia University Press 2018

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/em(ə)rəld/ noun 1 a bright green variety of the mineral beryl used as a gemstone: compare aquamarine , beryl . 2 athe...

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[13 century] Emerald traces its history back to an ancient Semitic verb ‘shine’ - bāraq . From this there seems to have been formed a noun...

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Illustrated Dictionary of Science, Andromeda

Valuable green Gem stone, a variety of Beryl . The best emeralds are mined in Colombia, Brazil and the USSR. Since 1935 it has been...

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