Emerald

Emeralds are fascinating gemstones. They have the most beautiful, most intense and
most radiant green that can possibly be imagined: emerald green. Inclusions are
tolerated. In top quality, fine emeralds are even more valuable than diamonds.

The name emerald comes from the Greek smaragdos via the Old French esmeralde, and
really just means 'green gemstone'. 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. Having said that, 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 was no wonder that the treasure chests of
Indian maharajas and maharanis contained wonderful emeralds. One of the world's
largest is the so-called 'Mogul Emerald'. It dates from 1695, weighs 217.80 carats, and is
some 10cm tall. One side of it is inscribed with prayer texts, and engraved on the other
there are magnificent floral ornaments. This legendary emerald was auctioned by
Christie's of London to an unidentified buyer for 2.2m US Dollars on September 28th
2001.

Emeralds have been held in high esteem since ancient times. For that reason, some of
the most famous emeralds are to be seen in museums and collections. The New York
Museum of Natural History, for example, has an exhibit in which a cup made of pure
emerald which belonged to the Emperor Jehangir is shown next to the 'Patricia', one of
the largest Colombian emerald crystals, which weighs 632 carats. The collection of the
Bank of Bogota includes five valuable emerald crystals with weights of between 220 and
1796 carats, and splendid emeralds also form part of the Iranian National Treasury,
adorning, for example, the diadem of the former Empress Farah. The Turkish sultans also
loved emeralds. In Istanbul's Topkapi Palace there are exhibits with items of jewellery,
writing-implements and daggers, each lavishly adorned with emeralds and other gems.
The green of life and of love
The green of the emerald is the colour of life and of the springtime, which comes round
again and again. But it has also, for centuries, been the colour of beauty and of constant
love. In ancient Rome, green was the colour of Venus, the goddess of beauty and love.
And today, this colour still occupies a special position in many cultures and religions.
Green, for example, is the holy colour of Islam. Many of the states of the Arab League
have green in their flags as a symbol of the unity of their faith. Yet this colour has a high
status in the Catholic Church too, where green is regarded as the most natural and the
most elemental of the liturgical colours
The magnificent green of the emerald is a colour which conveys harmony, love of Nature
and elemental joie de vivre. The human eye can never see enough of this unique colour.
Pliny commented that green gladdened the eye without tiring it. Green is perceived as
fresh and vivid, never as monotonous. And in view of the fact that this colour always
changes somewhat between the bright light of day and the artificial light of a lamp,
emerald green retains its lively vigour in all its nuances.
Fingerprints of nature
The lively luminosity of its colour makes the emerald a unique gemstone. However, really
good quality is fairly rare, with inclusions often marring the evenness of the colour –
signs of the turbulent genesis which has characterised this gemstone. Fine inclusions,
however, do not by any means diminish the high regard in which it is held. On the
contrary: even with inclusions, an emerald in a deep, lively green still has a much higher
value than an almost flawless emerald whose colour is paler. Affectionately, and rather
poetically, the specialists call the numerous crystal inclusions, cracks or fissures which
are typical of this gemstone 'jardin'. They regard the tender little green plants in the
emerald garden as features of the identity of a gem which has grown naturally.

So where do they come from and how is it that they exist at all? In order to answer these
questions, we need to look far, far back into the time of the emerald's origin. Emeralds
from Zimbabwe are among the oldest gemstones anywhere in the world. They were
already growing 2600 million years ago, whilst some specimens from Pakistan, for
example, are a mere 9 million years young. From a chemical-mineralogical point of view,
emeralds are beryllium-aluminium-silicates with a good hardness of 7_ to 8, and belong,
like the light blue aquamarine, the tender pink morganite, the golden heliodor and the
pale green beryl, to the large gemstone family of the beryls. Pure beryl is colourless. The
colours do not occur until traces of some other element are added. In the case of the
emerald, it is mainly traces of chromium and vanadium which are responsible for the
fascinating colour. Normally, these elements are concentrated in quite different parts of
the Earth's crust to beryllium, so the emerald should, strictly speaking, perhaps not exist
at all. But during intensive tectonic processes such as orogenesis, metamorphism,
emergences and erosion of the land, these contrasting elements found each other and
crystallised out to make one of our most beautiful gemstones. The tension involved in the
geological conditions conducive to the above processes produced some minor flaws,
and some major ones. A glance through the magnifying-glass or microscope into the
interior of an emerald tells us something about the eventful genesis of this unique gem:
here we see small or large fissures; here the sparkle of a mini-crystal or a small bubble;
here shapes of all kinds. While the crystals were still growing, some of these
manifestations had the chance to 'heal', and thus the jagged three-phase inclusions
typical of Colombian emeralds were formed: cavities filled with fluid, which often also
contain a small bubble of gas and some tiny crystals.

Logically enough, a genesis as turbulent as that of the emerald impedes the undisturbed
formation of large, flawless crystals. For this reason, it is only seldom that a large emerald
with good colour and good transparency is found. That is why fine emeralds are so
valuable. But for the very reason that the emerald has such a stormy past, it is surely
entitled to show it - that is, as long as only a fine jardin is to be seen, and not a rank
garden which spoils both colour and transparency.
The world of fine emeralds
Colombia continues to be at the top of the list in terms of the countries in which fine
emeralds are found. It has about 150 known deposits, though not all of these are
currently being exploited. The best known names are Muzo and Chivor, where emeralds
were mined by the Incas in pre-Columbian times. In economic terms, the most important
mine is at Coscuez, where some 60 faces are being worked. According to estimates,
approximately three quarters of Colombia's emerald production now comes from the
Coscuez Mine. Colombian emeralds differ from emeralds from other deposits in that they
have an especially fine, shining emerald green unimpaired by any kind of bluish tint. The
colour may vary slightly from find to find. This fascinatingly beautiful colour is so highly
esteemed in the international emerald trade that even obvious inclusions are regarded as
acceptable. But Colombia has yet more to offer: now and then the Colombian emerald
mines throw up rarities such as Trapiche emeralds with their six rays emanating from the
centre which resemble the spokes of a millwheel.

Even if many of the best emeralds are undisputedly of Colombian origin, the 'birthplace'
of a stone is never an absolute guarantee of its immaculate quality. Fine emeralds are
also found in other countries, such as Zambia, Brazil, Zimbabwe, Madagascar, Pakistan,
India, Afghanistan and Russia. Zambia, Zimbabwe and Brazil in particular have a good
reputation for fine emeralds in the international trade. Excellent emerald crystals in a
beautiful, deep emerald green and with good transparency come from Zambia. Their
colour is mostly darker than that of Colombian emeralds and often has a fine, slightly
bluish undertone. Emeralds which are mostly smaller, but very fine, in a vivacious,
intense green come from Zimbabwe's famous Sandawana Mine, and they often have a
delicate yellowish-green nuance. And the famous emerald mines of Colombia currently
face competition from right next door: Brazil's gemstone mine Nova Era also produces
emeralds in beautiful green tones, and if they are less attractive than those of their
famous neighbour it is only by a small margin. Brazil also supplies rare emerald cat's
eyes and extremely rare emeralds with a six-spoked star. Thanks to the finds in Africa
and Brazil, there are more emeralds on the market now than there used to be - to the
delight of emerald enthusiasts - .
A sophisticated gemstone
Whilst its good hardness protects the emerald to a large extent from scratches, its
brittleness and its many fissures can make cutting, setting and cleaning rather difficult.
Even for a skilled gem cutter, cutting emeralds presents a special challenge, firstly
because of the high value of the raw crystals, and secondly because of the frequent
inclusions. However, this does not detract from the cutters' love of 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 bevelled 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.
Today, many emeralds are enhanced with colourless oils or resins. This is a general
trade practice, but it does have the consequence that these green treasures react very
sensitively to inappropriate treatment. For example, they cannot be cleaned in an
ultrasonic bath. The substances that may have been used by the cutter during his work,
or applied subsequently, seal the fine pores in the surface of the gem. Removing them
will end up giving the stone a matt appearance. For this reason, emerald rings should
always be taken off before the wearer puts his or her hands in water containing cleansing
agent.
A matter of trust
Unfortunately, because the emerald is not only one of the most beautiful gemstones, but
also one of the most valuable, there are innumerable synthetics and imitations. So how
can you protect yourself from these 'fakes'? Well, the best way is to buy from a specialist
in whom you have confidence. Large emeralds in particular should only be purchased
with a report from a reputable gemmological institute. Such an institute will be able,
thanks to the most modern examination techniques, to differentiate reliably between
natural and synthetic emeralds, and will inform you as to whether the stone has
undergone any treatment of the kind a purchaser has the right to know about.
And one more piece of advice on the purchase of an emerald: whilst diamonds
generously scintillate their fire in sizes below 1 carat, you should go for larger
dimensions when acquiring a coloured gemstone. True, there are some lovely pieces of
jewellery with small coloured gems to set decorative accents, but emeralds, like other
coloured gemstones, do not really begin to show that beautiful glow below a certain size.
How large 'your' emerald ends up will depend on your personal taste, and on your
budget. Really large specimens of top quality are rare. This means that the price of a top-
quality emerald may be higher than that of a diamond of the same weight. The fascination
exuded by a fine emerald is simply unique

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***Information about gems on this page provided by international colored gemstone association website.
For more information please visit www.gemstone.org.
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