|
Buying Turquoise:
Turquoise is
formed by the percolation of
meteoric material or groundwater
through aluminous rock in the
presence of copper. For this
reason, it is often associated
with copper deposits as a
secondary mineral, most often in
copper deposits in arid,
semiarid, or desert
environments.
This pendant is hand made from
natural polished turquoise and
the colour is light with
naturally occurring copper
deposits. Therefore each pendant
will be slightly different in
the way the copper deposits are
distributed.
Less than 3% of all the
turquoise on the market
worldwide is natural so be
cautious of turquoise which is
described as natural as it most
likely to comes from one of the
categories below.
Stabilized
Turquoise
- soft or "chalk" turquoise has
been infused with a clear epoxy
resin. The resin, under
pressure, absorbs into the rock,
which permanently hardens the
rock and deepens the colour.
Unlike the collectible natural
turquoise which deepens in
colour over time by gradually
absorbing oils from the skin as
it is worn, the colours in
stabilized turquoise are
permanent. Most of the turquoise
on the market is stabilized.
Stabilized turquoise is
still very beautiful, and is a
good buy.
Treated Turquoise
- soft or "chalk" turquoise that
is stabilized as described
above, except that the epoxy
resin is also dyed. Colours in
treated turquoise have a
tendency to look artificial.
Prices should be much less than
natural or stabilized.
Reconstituted
Turquoise
- turquoise "chalk" that is
lower grade and has been ground
into powder, saturated with
epoxy resin, dyed, and
compressed into blocks or cakes
to be cut into shapes for
jewellery making.
Imitation
Turquoise
- there is no turquoise in this
category. Either there are
stones like Howlite (white
stone, very porous) dyed to look
like turquoise or there is pure
plastic (epoxy resin) that has
been dyed to look like
turquoise. It is a shame that
these materials are set in
silver and priced as if they had
intrinsic value.
|