Gemology

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November 18, 2015
Lucara Diamond Corp. has discovered a 1,111-carat diamond in its Karowe Mine in Botswana, the second-largest gem-quality diamond ever discovered, according to the company. ...»
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by Andrew Lucas, Merilee Chapin, Moqing Lin and Xiaodan Jia, GIA
Benefiting from the availability of more gem materials and the power of a rapidly growing consumer market, Chinese designers now have the freedom to develop their design concepts and craftsmanship skills. ...»
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by Kristin A. Aldridge, GIA writer
If you’ve ever wondered why your diamond looks different in sunlight versus candlelight or daylight versus office lights, it’s because the cut of your diamond responds differently depending on the light and the environment you are in. ...»
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Lead glass-filled rubies represent material that’s heavily treated to improve transparency. Learn more about them in this video from the Gemological Institute of America before heading to the jewelry counter. ...»
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Putnisite, a new purple-pink mineral that is unique in structure and composition among the world’s 4,000 known mineral species, has been discovered at a mining site in Western Australia. ...»
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A 29.6-carat rough blue diamond, one of the rarest and most coveted in the world with a possible price tag of tens of millions of dollars, has been discovered at the famed Cullinan mine in South Africa by mining company Petra Diamonds Ltd. ...»
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September 10, 2013
Peruvian artist and master carver Luis Alberto Quispe Aparicio will debut a collection of 15 gem skulls on Oct. 18 at GIA’s ...»
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by Russell Shor, GIA senior industry analyst
In the nearly sixty years since the first synthetic diamonds were created, 2012 may be remembered as the year when they made a major impact in the market for gem-quality diamonds. ...»
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by Robert Weldon, GG. GIA Manager of Photography & Visual Communications
GIA attended the Arusha International Gem and Mineral Fair to learn how it can serve the local community with gemological education and resources. ...»
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There is no gemstone in the world quite like a diamond. Formed by nature, the average diamond is 3.3 billion years old. Rare and valuable, a diamond is a testament of endurance and strength, with unsurpassed brilliance and fire—a natural symbol of everlasting love. ...»
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Garnet actually is a group or family of mineral species with related chemical compositions in cubic form that can differ widely in their physical properties and appearance ...»
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Tanzanite is a spectacular blue, violetish-blue or bluish-purple variety of the mineral Zoisite, which is colored by vanadium. Initially discovered as small surface crystals in 1962 ...»
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Tourmaline is a complex borosilicate mineral family. When certain members of that family add copper, manganese and a trace amount of gold to their composition, a cuprian or Paraiba tourmaline results. ...»
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Gemologists place diamonds in categories called type Ia, Ib, IIa, and IIb. Each category has its own characteristics and color variations. The classification system is based on the presence (or absence) and type of impurity element. ...»
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by Donna Beaton GIA, New York
In September 2011, GIA was informed by Dudley Blauwet (Dudley Blauwet Gems, Louisville, Colorado) about a new find of citrine, which was represented to him as natural-color material from the Kitwe area of Zambia. ...»

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