Ea09 Emerald Specimen Colombia Coscuez Natural Rough Irregular Hexagonal Crystal For Sale
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EMERALD COLOMBIA COSCUEZ
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.
CUT/FORM: NATURAL HEXAGONAL CRYSTALS (100% NATURAL ROUGH FORM)
COLOR: TYPICAL COLOMBIA “EMERALD
CLARITY: TRANSLUCENT WITH
MANY “TYPICAL” AND BLACK “CARBON” INCLUSIONS
WEIGHT: ANYWHERE AND VERY APPROXIMATE BETWEEN 0,50 and 2,00 CARATS
SMALL, APPROXIMATE LENGTH 5-10 mm
ORIGIN: “COSCUEZ” COLOMBIA
TREATMENT: “COMMON” OIL
(DESCRIPTION OF QUALITY)
scale from “1” (very-bad quality) to “10” (top excellent quality)]
RATED “3” =
Color: Emerald green,
green, slightly yellowish green
Al2Be3Si6O18, aluminum beryllium silicate
(Hexagonal), hexagonal prisms
Hardness:7.5-8 (Mohs scale)
2.67 - 2.78
1.565 - 1.602
Color of streak:
683, 681, 662, 646, 637, 606, 594, 630-580, 477, 472
OTHER NAMES FOR EMERALDS
Serbian (Cyrillic Script):
Ngọc lục bảo
EMERALD is the mostprecious stonein
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
Emerald's precious green color is caused by trace amounts of chromium and
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
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
(GENERAL INFO VALID ONLY FOR CUT EMERALDS)
OUR EMERALDS ARE NOT CUT
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
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
PRODUCTION IN COSCUEZ COLOMBIA
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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NOTES AND CONDITIONS FROM
SEE IMAGES FOR CONDITION
FIRST ATTACHED IMAGEREPRESENTS THEACTUAL ITEMTHAT YOU WILL RECEIVE!
SECOND ATTACHED IMAGE (SHOWING NATURAL CRYSTAL
GROWTH OF EMERALD ON MATRIX) IS ONLY FOR BETTER UNDERSTANDING AND DOES NOT REPRESENT THE EMERALD LISTED!
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Ea09 Emerald Specimen Colombia Coscuez Natural Rough Irregular Hexagonal Crystal: