Ea09 Emerald Specimen Colombia Coscuez Natural Rough Irregular Hexagonal Crystal For Sale
EMERALD COLOMBIA COSCUEZ
NATURAL IRREGULAR HEXAGONAL CRYSTAL SPECIMEN
A VARIETY OFBERYL
A green gem variety of Beryl, highly sought after as a precious gem stone. The color in Emerald is caused by trace amounts of a chromophore such as Chromium or Vanadium.
ALL OUR EMERALDS:
CUT/FORM: NATURAL HEXAGONAL CRYSTALS (100% NATURAL ROUGH FORM)
COLOR: TYPICAL COLOMBIA “EMERALD GREEN”
CLARITY: TRANSLUCENT WITH MANY “TYPICAL” AND BLACK “CARBON” INCLUSIONS
CARAT WEIGHT: ANYWHERE AND VERY APPROXIMATE BETWEEN 0,50 and 2,00 CARATS PER STONE
DIMENSIONS: SMALL, APPROXIMATE LENGTH 5-10 mm
ORIGIN: “COSCUEZ” COLOMBIA
TREATMENT: “COMMON” OIL TREATMENT
Color: Emerald green, green, slightly yellowish green
Chemical composition: Al2Be3Si6O18, aluminum beryllium silicate
Crystal system: (Hexagonal), hexagonal prisms
Hardness:7.5-8 (Mohs scale)
Specific gravity: 2.67 - 2.78
Refractive index: 1.565 - 1.602
Color of streak: White
Absorption spectrum: 683, 681, 662, 646, 637, 606, 594, 630-580, 477, 472
Fluorescence: Usually none
OTHER NAMES FOR EMERALDS
Serbian (Cyrillic Script):
Ngọc lục bảo
EMERALD is the mostprecious stonein theberylgroup. The nameemerald comes from the Greek "smaragdos" via the Old French "esmeralde", and really just means 'green gemstone.' The wonderful green color of emerald is unparalleled in the gem world. It is not surprising then that emerald is classified as one of the traditional four precious stones along withsapphire, rubyanddiamond.
Emerald's precious green color is caused by trace amounts of chromium and vanadium.
Almost all natural emeralds contain characteristic inclusions. For that reason emeraldsare generally more fragile than otherberyland must be handled more gently. Almost all emeralds are treated with oil or resins to fill tiny cracks. With emerald, even more than other colored gems, it is color which is the chief determinant of value.
COMMON EMERALD TREATMENTS
Oiling is a common treatment of emerald. This term refers to the practice of immersing emeralds in a colorless oil or resin. Often this is done using a vacuum chamber to assist penetration. Non-standard treatments go beyond this to using green colored oils and hardened, epoxy-like resins.
These treatments dramatically improve the appearance of the gems, but necessitate special care in cleaning and setting. Steam cleaners, solvents and ultrasonic can remove the oils, making inclusions that had barely been visible stand out in sharp relief. That damage is temporary only, since emeralds can be re-oiled.
Emerald, by definition, is a medium or darker green to blue greenberyl, in which the green color is derived from impurities of chromium, vanadium, or a combination of both. The most popular and valuable color is a slightly bluish green in a medium dark tone with strong to vivid saturation. The term "Colombian" emerald is often been used to describe vivid, slightly bluish green stones of medium, to medium dark color, no matter what their actual geographic origin.Emeraldsof lighter color are sometimes called "Brazilian" emerald, even if they were mined in Africa.
Emerald looks best in daylight. Artificial light will expose inclusions and fractures that prove the stone to be a natural emerald.
Clarity is important, but inclusions are tolerated more in emerald than virtually any other gem. Unlike otherberylgems, emeralds often contain inclusions and other flaws. These flaws are not looked on as negative aspects for emerald like they would be for other gemstones. Indeed, these flaws are considered part of the character of the stone and are used to assure the purchaser of a natural stone.
(GENERAL INFO VALID ONLY FOR CUT EMERALDS)
OUR EMERALDS ARE NOT CUT
Cutters love this unique gem. Indeed, they have developed a special cut just for this gem: the emerald cut. The clear design of this rectangular or square cut with its oblique corners brings out the beauty of this valuable gemstone to the full, at the same time protecting it from mechanical strain.
Emeralds are also cut in many other, mainly classical shapes, but if the raw material contains a large number of inclusions, it may often be cut into a gently rounded cabochon, or into one of the emerald beads, which are so popular in India. Clear, transparent specimens come sometimes as brilliant cuts.
Emerald mining is nearly exclusively from host rocks, where the emerald has grown into small veins or on walls of cavities.
Colombia is the world center of mining emerald. The COSCUEZ mine, produces fine-quality stones of a deep green color. The Chivor and Muzo mine, northeast of Bogotá, is another important deposit, other locations promise additional successful mining results.
Brazil has various deposits in Bahia, Goias and Minas Gerais. The stones are lighter than the Colombian ones, mostly yellow-green and are often free of inclusions. Brazil also supplies rare emerald cat's eyes and extremely rare emeralds with a six-ray star.
South Africa deposits concentrate in the northern Transvaal. But only five percent of the stones found in the Cobra and Somerset Mines are of good quality. Most stones are light or muddy and only suitable for cabochon cuts.
Zimbabwe has several deposits of emerald; the most important is the Sandawana mine in the south. The crystals are small, but of very good quality.
Russia has deposits in the Ural north of Sverdlovsk. Good qualities are rare; most stones are light or muddy and only suitable for cabochons.
Further deposits are in Afghanistan, Australia (New South Wales, Western Australia), Ghana, India, Madagascar, Malawi, Mozambique, Namibia, Nigeria, Pakistan, Tanzania, Zambia and the United States (North Carolina).
PRODUCTION IN COSCUEZ COLOMBIA
It is impossible to present an approximation of the total production of the COSCUEZ mines. The pre-Spanish output, undoubtedly significant, is of course not open to any measure. In historic times, the exploitation was so irregular and the records so incomplete, that a fair basis for judgment is entirely lacking. Nevertheless, it is certain that the total output may be estimated in terms of hundreds of millions of dollars.
EMERALD ZODIAC, MYTH & LEGEND
Innumerable fantastic stories have grown up around this magnificent gem. The Incas and Aztecs of South America, where the best emeralds are still found today, regarded the emerald as a holy gemstone. However, probably the oldest known finds were once made near the Red Sea in Egypt. These gemstone mines, already exploited by Egyptian pharaohs between 3000 and 1500 B.C. and later referred to as 'Cleopatra's Mines', had already been exhausted by the time they were rediscovered in the early 19th century. Written many centuries ago, the Vedas, the holy scriptures of the Indians, say of the precious green gems and their healing properties: 'Emeralds promise good luck...' and 'The emerald enhances the well-being...'. So it is no wonder that the treasure chests of Indian maharajas and maharanis contained wonderful emeralds.
Emerald is thebirthstonefor those who are born in May.Emeraldis the gemstone for commemorating the 20th and 35th wedding anniversaries.
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