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Amber Mines
By:Mark.
Interactive Amber Mines Map
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Gemstone Mining Methods
By:Sheweta Dhanuka.
Gemstones are treasured by most of us and to retrieve these precious gems from deep down the earth crust one has to go in for treasure hunt. Gemstone Mining is very complex and tedious process that requires huge input of valuable resources such as time, workforce, equipments and knowledge etc. There are different methods for recovering the gemstone from the lap of Mother Nature. The appropriate procedure is selected depending upon the circumstances but no matter what method is selected the entire process of gemstone mining needs to be very systematic as it costs a lot of money. The total process of gemstone mining is so intricate that inspite of putting in so much efforts there is no surety of the results. Failures and disappointments always have higher percentage than the success. ...
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Important Ruby Mines
By:Ritika Changrani.
For thousands of years the Ruby has been considered the one of the most precious of the twelve stones created by God. Ruby mines are found in USA, Sri Lanka, Burma, Vietnam, Thailand etc....
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Jewellers Loupe
By:Ritika Changrani.
A jeweller's loupe is a tool that helps identify the internal flaws, cracks and blemishes on the surface and any other cover ups on the gemstone....
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Aquamarine Identification
By:Erum Qureshi.
Aquamarines, belonging to the Beryl family, are relatively easy to identify. Various simple tests can reveal the authenticity of an aquamarine stone. ...
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Spinel Identification
By:Erum Qureshi.
A gemstone purported to be a spinel undergoes stringent tests in the lab for authenticity and grades (i.e. quality). It has distinctive characteristics and traits that a gemologist can easily identify. ...
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Spectroscope
By:Ritika Changrani.
A Spectroscope helps to identify cut stones, rough stones, mounted stones and unmounted stones to see whether they are real or fakes. ...
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Refractometer
By:Ritika Changrani.
A Refractometer is a gemmological tool used to find the ability of gemstone to bend or refract light. This measure is the refractive index of a gemstone. ...
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Polariscope
By:Ritika Changrani.
Polariscope is an instrument used in gemmology which helps to find if the gemstone is single refractive or double refractive and also allows determining the various crystal axis of the stone. ...
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Dichroscope
By:Ritika Changrani.
Dichroscope is a tool used to differentiate similar looking gemstones based on the dichroic property of the gemstones. ...
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Chelsea Filter
By:Ritika Changrani.
Also known as Emerald filter, Chelsea filter is used to identify natural, synthetic and imitated gemstones. Developed by the British Gemmologists Anderson and Payne, this filter was initially developed only for the separation of natural emerald from green beryl. Now it is being used to identify various gemstones. ...
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Lab identification of Sapphire
By:Erum Qureshi.
Sapphire, derived from the Greek word sapphirus, literally means blue. Many people will find it difficult to believe that ruby, with its intense red color and the royal blue sapphire are the same mineral corundum composed of oxygen and the light metal aluminium. ...
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Ruby Identification
By:Erum Qureshi.
Step by step laboratory identification procedure for Rubies. "There are numerous tests conducted to identify true rubies. Various characteristics and traits are judged by a gemologist to authenticate and grade a ruby" ...
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Emerald Identification
By:Erum Qureshi.
Step by step lab procedure to identify the green stone emerald in scientific manner. Learn from an expert, how the Refractive Index, Double Refraction, Absorption Spectra is used to determine the stone type. ...
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Gemstone Hardness Chart
By:Mark.
Gemstone Hardness Chart in Mohs scale
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Gemstone Cutting
By:Sheweta Dhanuka.
Gem cutting is a long process that takes many months to convert simple rough into fascinating gemstone. It involves many steps. In order to acquaint the reader with the overall process of gem cutting, all the steps are explained one after the other. The steps elucidated are not in any fixed sequence. ...
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Opalescence effects in Opal
By:Nasrina Parvin Khan.
The milky, turbid aspects of opal described as opalescence. This phenomenon has been seen in common opal or potch opal. These types of opal do not show a play of color. ...
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Gemstone Testing tools
By:Ms Nandita Ray.
It is tricky to test a gemstone. Some stones are soft, some are mounted while some can be coated, treated or easily scratched. One has to be very careful so as not to damage the stone in any way. With technology advancing rapidly, the tools used for testing are made to suit ones needs and pockets. Aiding the tools is a wide range of database, which lists the particular characteristics of gems. ...
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Color Change phenomenon in Gems
By:NASRINA PARVIN KHAN.
Gems change their color according to the nature of the light they are seen. Alexandrite appears gr4een in daylight or fluorescent light (blue in rich) and in incandescent light (orange to red rich light) it appears as red. ...
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Labradorescence
By:Nasrina Parvin Khan.
Labradorescence is an exclusive optical phenomenon that has solely shown by the feldspar gem Labradorite in this earth. ...
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Play of Color
By:Nasrina Parvin Khan.
A well-known Play-of-color gemstone is opal. Opal is an amorphous from of silica (sio2, nh2o). It is made up of sub microscopic spheres of silica with a little amount of water and air trapped in the spaces between these round spheres. ...
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Asterism in Gems
By:Nasrina Parvin Khan.
"Asterism" is an exclusive light effect (which we called special optical phenomenon) of some crystal. When light pass through these crystals, its exhibit a star-shaped figure, which called "asterism". ...
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Special Optic Phenomena in Gems
By:Nasrina Parvin Khan.
Asterism, chatoyancy, play-of-color, opalescence, labradorscene, adularescence and color change are some special optic phenomena which have been seen in gems. ...
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Topaz - How to Identify
By:Ardamun.
Citrine is mostly, and erroneously, called topaz, though both are two distinct species. Citrine is quartz, and is much lighter than topaz, which is Hydroxyl Fluorosilicate of Aluminum. ...
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How to differentiate synthetic and natural sapphire
By:Ashutosh Roy.
A deep look shows signs of slow crystallization in case of natural sapphires. Sometimes some external elements in very small quantities are visible in original sapphire like most other gemstones. ...
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Pleochroism in gemstones
By:Yuman Hussain.
Scientific explanation of pleochronism which is an ability of the stone to absorb different wavelengths of light displaying brilliant colors when viewed from different directions. ...
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International Colored Gemstone Association - ICA
By:Ashish Dimri.
International colored Gemstone Association has its headquarters in Newyork city; U.S.A. It also has additional bureaus in Idar- Oberstein and Israel. It has over 400 members in 41 countries worldwide. ...
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How to differentiate synthetic and natural emerald
By:Ashish Dimri.
Synthetic emeralds are produced in Germany, France, and United States of America with flux growth and hydrothermal processes in laboratory. These are expensive methods and difficult to yield major results .It is mentioned that the first synthetic emerald appeared in last part of last century. ...
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How Pearls are graded
By:Bina Shaji Kurup.
A good pearl has several qualities and based on these qualities pearls are graded. There are two systems of grading pearls, which are accepted worldwide. One system is the “Tahitian” system developed by the Polynesian government. This system is used to grade Black Tahiti pearls and other Saltwater pearls like the South Sea pearls. The other is the “AAA – A” system, which is used to grade cultured Freshwater pearls. ...
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Factors affecting quality of pearls
By:Bina shaji kurup.
An important factor in deciding the quality of the Pearl is its Luster. A high luster is visible in the reflections on the surface of the pearl – a clearer reflection signifies a better luster and such pearls seem to have a warm glow. The luster of the pearl is dependant on the thickness of the nacre coating on the pearl – it is normally understood that the longer a pearl is left inside the mollusk, the thicker is the nacre layer. ...
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How gemstone hardness measured
By:Binashaji.
Diamonds measure 10 on the MOHS scale and Aquamarine measures 7 whereas Pearls can measure between 3 and 4 on the MOHS scale. MOHS is a term oft used in Gemstone Jewellery, but what exactly does MOHS mean and signify?...
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Appraising the Value of Gems
By:Mathew Abraham.
Gems are appraised mainly to determine their fair market value (FMV) or for insurance purposes. Qualified gemologists undergo specialized training to be certified as accredited appraisers of gems. If a gem has been certified by a Master Gemologist Appraiser, his/her valuation is accepted as final. ...
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