- A gemstone or gem, also
called a precious or semi-precious stone, is a piece of attractive
mineral, which when cut and polished is used to make jewelry or other
adornments.
- However certain rocks,
and organic materials are not minerals, but are still used for jewelry,
and are therefore often considered to be gemstones as well.
- Most gemstones are
hard, but some soft minerals are used in jewelry because of their lustre
or other physical properties that have aesthetic value.
- Gemstones are
identified by gemologists, who describe gems and their characteristics
using technical terminology specific to the field of gemology. The first
characteristic a gemologist uses to identify a gemstone is its chemical
composition.
- There are a number of
good machines available for cutting precious stones - a process called
faceting.
- Although the
machines may look
complicated, they consist primarily of a grinding
plate called a lap and a set of protractors that help the faceter hold
the stone accurately against the
lap.
- The faceter controls
the actual faceting process during the grinding and polishing processes
on each face of the stone.
- Raman
micro-spectroscopy is an ideal method for the examination of marketable
gemstones. The lack of sample preparation and the
non-destructive
nature of Raman analysis make it ideal for the analysis of even
high-value gems.
- Gemstone is heated to
high degrees which is called gemstone heating. Most real Blue Sapphires
today are heated to high degrees during natural faceting process.
- Merchants in Peshawar,
Pakistan, cut low-value stones for the domestic market and send the
medium and high quality stones to centres around the world for accurate
cutting for the Western markets.
- The gemstone and
jewellery sub-sector in Kenya is liberalized; there are no trade
restrictions. So long as a miner or dealer is licensed, he or she can
trade in an otherwise free market.
- The gems and jewellery
industry occupies an important position in the Indian economy. It is a
leading foreign exchange earner, as well as one of the fastest growing
industries in the country.
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General
Information
- Information about
Gemstones
- Gemmology course
certification
- Disclosure requirements
for natural gemstones
- General terms and
conditions for gemstones
- Synthetic and
simulants
- Gemstone open
settings
Company
- Company from India
- Company from Jaipur
- Company from SouthCarolina
- Company from Thailand
- Company from USA
Consultant
- Consultant from Chicago
- Consultant from Georgia
- Consultant from Newyork
- Consultant from NorthCaolina
- Consultant from Texsas
Gemstone
Types
- Amethyst
- Apatite
- Beryl
- Citrine
- Coral
- Diamond
- Emerald
- Garnet
- Jasper
- Tanzanite
- Chrysoprase
Sapphire
List of gemstones
Pearl
Quartz
Ruby
Sunstone
Topaz
Zircon
Tiger's eye
Process
- Gem cutting process
- Gem stone heat and faceting
- Gemstone Identification
Using Raman Spectroscopy
Signity Pre-setting - the simplest way
to set stones
Verneuil process
Products
-
Gemcount
-
List of
gemstone products
-
Accuracy and
precision products in the gem industry
-
Healing
Gems-Skin care products
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Suppliers
Suppliers of
gemstones
Tradeleads of
gemstones
Manufacturers of
gemstones
Sellingleads of
gemstones
Gemstone
suppliers
Buyers
Patent
- Combined gem
setting and gem stones
- Cut cornered
square mixed cut gemstone
- Faceted mixed
cut gemstone for controlled brilliance
- Process for
irradiating gemstones
- Apparatus and
process for detecting man made gemstones
Quality
-
Apparatus and process for detecting man made gemstones
-
Quality in
colored gemstones
-
Quality
assurance in gemstones
-
Carbon-bonded gemstones look like the real thing
Production
-
Gemstones
production in western Australia
-
Domestic
production and use of Gemstones
-
Gemstone
production
-
Renewed focus
on Greenland gemstones
-
Gemstone
production in 2002
-
Gem
production in Pakistan
-
Gem
production in USA
Market
- Assessment of Afghanisthan Gem stone
industry
- Emeralds, rubies and saphires a Canadian
supply
- Irradiated Gemstones
- Gems and jewellery market
- Gemstones and jewellery in Kenya
- Afghanisthan's Gemstones
- Gemstones of Afghanistan
Report
- Mining report on
Brazil
- Minerals in
Britain
- Report on buying
jewellery
- Hong Kong Report
- Domestic survey on Gemstones
- Union investigation reveals dirty end of the
diamond and precious stones buisness
- Gemstones statistics
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