Determines whether blue zircon, inadvertently altered to brown by exposure to long-wave UV radiation, can be restored to its original colour through the use of incandescent light.
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Although colourless when chemically pure, zircon is typically yellow-brown to brown. It also comes in red, blue, purple, and green. Because of its high brilliance and dispersion, colourless zircon has sometimes been used as a substitute for diamond in jewellery.
Read MoreZircon occurs in an array of colours. Its wide and varied palette of yellow, green, red, reddish brown and blue hues makes it a favourite among collectors as well as informed consumers.
Read MoreMany people have heard of zircon but never seen it. This is mostly because of colourless zircon’s wide use as a diamond simulant in the early 1900s.
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Green gemstones, which can uplift and heal our spirits, have been popular gem choices ever since we began to adorn ourselves with jewellery.
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A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.
Read MoreA compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewellery manufacturing techniques and industry trends.
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Trace-element analysis is used to identify metamictisation, treatment and growth conditions of zircon.
Read MoreThis section, from the Winter 2011 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.
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