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Smaragd ist eine Varietät des im hexagonalen Kristallsystem kristallisierenden Silikat-Minerals Beryll und hat eine Mohshärte von 7,5 bis 8. Seine chemische Zusammensetzung ist durch Al₂Be₃[Si₆O₁₈] beschrieben. Die Farbe ist durch Beimengung von. Emerald (englisch für ‚Smaragd') bezeichnet: Emerald (schweizerische Band), Schweizer Heavy-Metal-Band; Emerald (Spiel), Brettspiel von Rüdiger Dorn. Sie wurden zu Werbezwecken unter dem Namen Igmerald, einem Kunstwort aus I.G. und dem englischen Wort emerald für Smaragd, vertrieben. Beispiele of emerald. emerald. The crown is decorated with emeralds, diamands, garnets, and other jewels. Aus. Wikipedia. Now, of the big 3 (ruby, sapphire and emerald) ruby always was the most "difficult" rock, be it because truly fine rubies always were rare and expensive.
emerald toucanet [ZOOL.] der Laucharassari auch: Lauch-Arassari wiss.: Aulacorhynchus prasinus [Vogelkunde]. Now, of the big 3 (ruby, sapphire and emerald) ruby always was the most "difficult" rock, be it because truly fine rubies always were rare and expensive. Beispiele of emerald. emerald. The crown is decorated with emeralds, diamands, garnets, and other jewels. Aus. Wikipedia.
As a result, vanadium emeralds purchased as emeralds in the United States are not recognized as such in the UK and Europe. In America, the distinction between traditional emeralds and the new vanadium kind is often reflected in the use of terms such as " Colombian emerald ".
In gemology,  color is divided into three components: hue , saturation , and tone. Emeralds occur in hues ranging from yellow-green to blue-green, with the primary hue necessarily being green.
Yellow and blue are the normal secondary hues found in emeralds. Only gems that are medium to dark in tone are considered emeralds; light-toned gems are known instead by the species name green beryl.
In addition, a fine emerald will be saturated and have a hue that is bright vivid. Gray is the normal saturation modifier or mask found in emeralds; a grayish-green hue is a dull-green hue.
Emeralds tend to have numerous inclusions and surface-breaking fissures. Unlike diamonds, where the loupe standard, i.
Thus, if an emerald has no visible inclusions to the eye assuming normal visual acuity it is considered flawless. Stones that lack surface breaking fissures are extremely rare and therefore almost all emeralds are treated "oiled", see below to enhance the apparent clarity.
The inclusions and fissures within an emerald are sometimes described as jardin French for garden , because of their mossy appearance.
Faceted emeralds are most commonly given an oval cut, or the signature emerald cut, a rectangular cut with facets around the top edge. Most emeralds are oiled as part of the post- lapidary process, in order to fill in surface-reaching cracks so that clarity and stability are improved.
Cedar oil , having a similar refractive index , is often used in this widely adopted practice. Other liquids, including synthetic oils and polymers with refractive indexes close to that of emeralds, such as Opticon , are also used.
These treatments are typically applied in a vacuum chamber under mild heat, to open the pores of the stone and allow the fracture-filling agent to be absorbed more effectively.
Federal Trade Commission requires the disclosure of this treatment when an oil treated emerald is sold. Other treatments, for example the use of green-tinted oil, are not acceptable in the trade.
These categories reflect levels of enhancement, not clarity. A gem graded none on the enhancement scale may still exhibit visible inclusions.
Laboratories apply these criteria differently. Some gemologists consider the mere presence of oil or polymers to constitute enhancement.
Others may ignore traces of oil if the presence of the material does not improve the look of the gemstone.
Mining ceased with the discovery of the Colombian deposits; only ruins remain. Since the onset of concerns regarding diamond origins, research has been conducted to determine if the mining location could be determined for an emerald already in circulation.
Traditional research used qualitative guidelines such as an emerald's color, style and quality of cutting, type of fracture filling, and the anthropological origins of the artifacts bearing the mineral to determine the emerald's mine location.
More recent studies using energy dispersive X-ray spectroscopy methods have uncovered trace chemical element differences between emeralds, including ones mined in close proximity to one another.
American gemologist David Cronin and his colleagues have extensively examined the chemical signatures of emeralds resulting from fluid dynamics and subtle precipitation mechanisms, and their research demonstrated the chemical homogeneity of emeralds from the same mining location and the statistical differences that exist between emeralds from different mining locations, including those between the three locations: Muzo, Coscuez, and Chivor, in Colombia, South America.
Both hydrothermal and flux-growth synthetics have been produced, and a method has been developed for producing an emerald overgrowth on colorless beryl.
The first commercially successful emerald synthesis process was that of Carroll Chatham , likely involving a lithium vanadate flux process, as Chatham's emeralds do not have any water and contain traces of vanadate, molybdenum and vanadium.
Gilson's emeralds are usually grown on natural colorless beryl seeds, which are coated on both sides.
Hydrothermal synthetic emeralds have been attributed to IG Farben , Nacken, Tairus , and others, but the first satisfactory commercial product was that of Johann Lechleitner of Innsbruck , Austria, which appeared on the market in the s.
These stones were initially sold under the names "Emerita" and "Symeralds", and they were grown as a thin layer of emerald on top of natural colorless beryl stones.
Later, from to , the Linde Division of Union Carbide produced completely synthetic emeralds by hydrothermal synthesis.
According to their patents attributable to E. Flanigen ,  acidic conditions are essential to prevent the chromium which is used as the colorant from precipitating.
Also, it is important that the silicon-containing nutrient be kept away from the other ingredients to prevent nucleation and confine growth to the seed crystals.
Growth occurs by a diffusion-reaction process, assisted by convection. Many synthetics are also UV inert. Synthetic emeralds are often referred to as "created", as their chemical and gemological composition is the same as their natural counterparts.
The U. Federal Trade Commission FTC has very strict regulations as to what can and what cannot be called a "synthetic" stone. Emerald is regarded as the traditional birthstone for May as well as the traditional gemstone for the astrological sign of Cancer.
On one of Cortez's most notable emeralds he had the text engraved , Inter Natos Mulierum non sur-rexit mayor "Among those born of woman there hath not arisen a greater," Matthew which referred to John the Baptist.
The chief deity of one of India's most famous temples, the Meenakshi Amman Temple in Madurai , is the goddess Meenakshi , whose idol is traditionally thought to be made of emerald.
The Chalk Emerald ring, containing a top-quality carat emerald, in the U. National Museum of Natural History. A 5- carat emerald from Muzo with hexagonal cross-section.
Large, di-hexagonal prismatic crystal of 1, carats uncut with a deep green color. Housed at the Mim Museum , Beirut, Lebanon.
From Wikipedia, the free encyclopedia. For other uses, see Emerald disambiguation. Green gemstone, a beryl variety. Emerald crystal from Muzo , Colombia.
Colombian emeralds. Minerals portal. July 19, Archived from the original on July 12, Retrieved July 30, Gemological Institute of America.
Archived from the original on November 2, Retrieved November 1, Online Etymology Dictionary. Brunswick House Press, p. Rock and gem. New York: DK Pub.
Federal Trade Commission. May 30, Archived from the original on September 7, October 22, Archived from the original on March 31, Retrieved March 30, Gemstone Press.
Archived from the original on March 30, Bibcode : Sci Archived PDF from the original on August 7, Its beautiful green color, combined with durability and rarity, make it one of the most expensive gemstones.
Deep green is the most desired color in Emeralds. In general the paler the color of an Emerald, the lesser its value. Very pale colored stones are not called Emeralds but rather " Green Beryl ".
They are sometimes heat treated , which causes their color to turn blue and transform into Aquamarine. Let us know how we can update this page Click for more details.
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Chemical Formula. Crystal System. Refractive Index. Transparent to translucent. Double Refraction. Mineral Class. Beryl Emerald.
Emerald is by far the most valuable gemstone variety of Beryl, being one of the few precious gemstones. Emeralds are notorious for their flaw s.
Flawless stones are very uncommon, and are noted for their great value. Some actually prefer Emeralds with minute flaws over flawless Emeralds, as this proves authenticity.
Flaws are often hidden by treating the Emeralds with oil or synthetic lubricants, and this is a common practice in the industry. Though Colombian Emeralds have traditionally been the highest quality Emeralds with the finest green color, a new source of Emerald from the African country of Zambia has been producing deep green Emeralds with fewer flaws.
Many Emerald fakes and doublet s are known. Two pale colored stones may be glued together with a deep green paste, creating a stone resembling Emerald.
Faceted green glass also resembles Emerald, and it may be coated with a hard substance to mask its low hardness. Synthetic Emeralds are also sold to unwary buyers without them knowing the stone is synthetic.
Experts can distinguish all these fakes, and it is especially important to only purchase Emeralds from reliable dealers. Experts can also determine if an Emerald was treated with oil or a lubricant to mask internal flaw s.
A rare and unusual form of Emerald, known as "Trapiche Emerald", is characterized by star-shaped rays that emanate from the center of a stone in a hexagonal pattern.
These rays appear much like asterism , but, unlike asterism, are not caused by light reflection from tiny parallel inclusion s, but by black carbon impurities that form in a star-shaped pattern.
These Trapiche Emeralds are only found in the Boyaca Emerald mining district of Colombia, and are cut into cabochon s. Though Emerald has good hardness, it is a brittle stone.
It may develop internal cracks if banged hard or if subject to extreme temperature change.Very Light Purple. Carved Sheep. Pear Facet. Captivating Beste Spielothek in Rantum finden. Lively Green. Deep Sky Blue. Carved Baguette. Light Cornflower Blue. Emerald is the birthstone of May. Emeralds tend to have numerous inclusions and surface-breaking fissures. emerald toucanet [ZOOL.] der Laucharassari auch: Lauch-Arassari wiss.: Aulacorhynchus prasinus [Vogelkunde]. mellowradio.nl | Übersetzungen für 'emeralds' im Englisch-Deutsch-Wörterbuch, mit echten Sprachaufnahmen, Illustrationen, Beugungsformen. We purchase all our emeralds via our own office in the Emerald Trade Center in Bogotá. We monitor every stage of processing, starting at the mine, including. Marchioness of Londonderry Famous Emeralds | Berühmte Schmuckstücke und Juwelen | Diamanten als Schmuck der Marquess von Londonderry| Diamant. Design and Sketch of the Harcourt Smaragde - Collier und Diadem | Harcourt Emeralds - The famous Necklace and the outstanding Tiara.