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Gallery Quality

The
turquoise is ancient, yet again and again it finds itself back in fashion. Its
shining sky blue is one of the most popular trend colors in the world of
jewelry and fashion
In many cultures
of the Old and New Worlds, this gemstone has been esteemed for thousands of
years as a holy stone, a bringer of good fortune or a talisman. It really does
have the right to be called a 'gemstone of the peoples'. The oldest evidence
for this claim was found in Egypt, where grave furnishings with turquoise inlay
were discovered, dating from approximately 3000 B.C.. In the ancient Persian
kingdom, the sky-blue gemstones were earlier worn round the neck or wrist as
protection against unnatural death. If they changed color, the wearer was
thought to have reason to fear the approach of doom. Meanwhile, it has been
discovered that the turquoise certainly can change color, but that this is not
necessarily a sign of impending danger. The change can be caused by the light,
or by a chemical reaction brought about by cosmetics, dust or the acidity of
the skin. A good reason to buy only stabalized Turquoise, which doesn't change
for any reason.
Turquoise is a
copper aluminium phosphate with a hardness of 6, i.e. considerably softer than
quartz. In Nature, it occurs in the whole range of hues from sky blue to
grey-green, and it is mostly found in places where there is a high
concentration of copper in the soil. However, turquoise is only really
turquoise in the very best quality; mostly, the colour is paler, or
bluish-green or greenish. The blue colour is created by copper, the green by
bivalent iron and a certain amount of chrome. Often, the material has veins or
blotches running through it, which are brown, light grey or black depending on
where it was found. These lively, more or less regular patterns are known as
'turquoise matrix'. The crystals are microscopically small and can hardly ever
be recognised with the naked eye. As a rule, turquoise occurs as a fillung in
veins or crevices, or in the form of nuggets. The most well known deposits are
in the USA, Mexico, Israel, Iran, Afghanistan and China. The most beautiful
turquoises, in a splendid light blue, come from deposits in the north of Iran.
Turquoise is rarely faceted. Usually,
it is cut into cabochons or beads, or into some more imaginative shape.
Wax makes turquoise more resistant Being relatively soft, turquoises
are sensitive. As the colour may pale when the stone has been worn for a long
time, even high-quality recognizedstones today are treated with wax and
subsequently hardened. This treatment makes the sensitive gemstone more
resistant. In the trade, there are a large number of reasonably priced
turquoises sealed with synthetic resin. They have a fresh color and good
durability. And there is also such a thing as a 'reconstructed turquoise',
which is made from pulverized turquoise.
Because of their sensitivity, turquoises are almost
always subjected to treatment of one kind or another, though this may take any
of a number of different forms. For this reason, turquoises which have a good
natural color and are simply hardened with colorless wax or synthetic resin
have a much higher value than stones whose color has been 'improved'.
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