emerald

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emerald,

the green variety of berylberyl
, mineral, a silicate of beryllium and aluminum, Be3Al2Si6O18, extremely hard, occurring in hexagonal crystals that may be of enormous size and are usually white, yellow, green, blue, or colorless.
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, 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 some of 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 rare and 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 corundumcorundum
, mineral, aluminum oxide, Al2O3. The clear varieties are used as gems and the opaque as abrasive materials. Corundum occurs in crystals of the hexagonal system and in masses. It is transparent to opaque and has a vitreous to adamantine luster.
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Emerald

 

a mineral that is a transparent variety of beryl tinged with an admixture of Crj03 to a deep grass-green color. Emeralds are found in crystals and their concretions, usually intergrown in micaceous rock, quartz, or feldspar. The crystals, measuring 2–5 cm by 0.5–2 cm, rarely larger, are fractured. The larger deposits are connected with zones of the contact alteration of amphibolites, magnesial schist, and serpentinites by granitic pegmatites. Emeralds are also found in quartz feldspar veins and in altered schistose-carbonate rocks. Deposits are rare and are mainly in the USSR (Urals), Republic of South Africa (Transvaal), and Colombia (Muzo). Emeralds are highly valued as gems; those that are large (more than 5 carats), flawless, and have a deep, rich color are considered to be more valuable than diamonds.

Synthetic emeralds (so-called igmeralds) are made, but their crystals are often fissured and no larger than 0.5 by 3 cm.

emerald

[′em·rəld]
(mineralogy)
Al2(Be3Si6O18) A brilliant-green to grass-green gem variety of beryl that crystallizes in the hexagonal system; green color is caused by varying amounts of chromium. Also known as smaragd.

emerald

May. [Am. Gem Symbolism: Kunz, 319–320]

emerald

relieves diseases of the eye. [Gem Symbolism: Kunz, 370]
See: Healing

emerald

1. a green transparent variety of beryl: highly valued as a gem
2. 
a. the clear green colour of an emerald
b. (as adjective): an emerald carpet

Emerald

An object-oriented distributed programming language and environment developed at the University of Washington in the early 1980s. Emeral was the successor to EPL. It is strongly typed and uses signatures and prototypes rather than inheritance.

["Distribution and Abstract Types in Emerald", A. Black et al, IEEE Trans Soft Eng SE-13(1):65-76 (Jan 1987)].
References in classic literature ?
in me you behold the Body- Guard of our gracious Ruler, Princess Ozma, as well as the Royal Army of Oz and the Police Force of the Emerald City.
An hour ago I was called to the presence of her Highness, Ozma of Oz, and told to arrest a boy named Ojo the Unlucky, who was journeying from the Munchkin Country to the Emerald City and would arrive in a short time.
I ordered the Emerald City to be built just where the four countries cornered together, and when it was completed I announced myself the Ruler of the Land of Oz, which included all the four countries of the Munchkins, the Gillikins, the Winkies and the Quadlings.
We owe a great deal to the Wonderful Wizard," continued the Princess, "for it was you who built this splendid Emerald City.
How long did you rule the Emerald City, after I left here?
He was a bad man and a powerful monarch, and he had resolved to destroy the Land of Oz and its magnificent Emerald City, to enslave Princess Ozma and little Dorothy and all the Oz people, and recover his Magic Belt.
Beryl mining ceased in Egypt with Spain's discovery of superior-quality Colombian emeralds in the 16th century AD.
The investigators used this signature to link various emeralds with their known sites of origin.
Pink Emeralds of investment grade are extremely beautiful, scarce and are seldom offered for sale to the general public.
Emeralds are a kind of beryl--beryllium aluminum silicate with a dash of chromium, which produces the characteristic green.
The property is approximately one-quarter mile from the portion of the Rist Mine where discoveries of more than 3,000 carats of emeralds have made world headlines since 1998.
It is one of nearly 100 world class emeralds discovered at the site.