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| LA-ICPMS |
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| Laser
Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS) is the
state
of the art technique for chemical micro-analysis of solid materials. It
has a
wide range of applications in many different fields of science and
industry. In
the past couple of years LA-ICPMS has become more and more important in
gemmology as standard analytical techniques are facing their limits in
many
cases. More
Details » |
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Information
Letter January 2008 |
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Reduction in the cost of a professional service is
indeed an uncommon event. Such a rarity is upon us! The new ‘Gübelin
Gem Lab
Tariff: 2008’ (enclosed) lists a reduction of almost 8% - across the
board - on our 2007 prices, for companies outside Switzerland. This
reduction
has been made possible by a re-interpretation of VAT regulations by the
Swiss
Tax Authority. We are happy to pass on this advantage, in full, to our
foreign
clients.
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Laboratory
Manual Harmonisation Committee (LMHC) |
| The Laboratory Manual
Harmonisation Committee (LMHC)
consists of representatives of the following renowned gemmological
laboratories: AGTA-Gemological Testing Center (USA), CISGEM (Italy),
GAAJ Laboratory (Japan), GIA-Gem Trade Laboratory (USA), GIT-Gem
Testing Laboratory (Thailand), Gubelin Gem Lab (Switzerland), SSEF
Swiss Gemmological Institute (Switzerland). More Details » |
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Forged Gübelin Gem Lab Reports |
| Every now and again we are
confronted with fake Gubelin Gem Lab
reports. A counterfeit report may have an immense impact on the value
of a stone and unpleasant consequences for the end consumer.
More Details » |
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Trade Colours |
| For many centuries, gemstone
traders have been using
certain terms to describe the outstanding colours of some specific
gemstones.
These “trade colour terms” are used by the majority of people in the
gem trade
for a certain quality of gemstones, mainly describing a certain hue,
but also
implying other quality criteria, such as transparency, size or the
presence or
absence of treatments. More Details » |
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Golconda |
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"Golconda" is a historic term which refers to diamonds exhibiting an antique cutting style as well as a superior quality. They are very rarely encountered in the gem trade today. In addition, they have properties typical of type IIa natural diamonds (a chemically very pure type of natural diamond). They display a colour and degree of transparency which are particular to the finest of these unique gemstones. |
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