A report on the colour treatment process for these intensely greenish yellow to yellowish-green cultured pearls and the techniques for identifying them.
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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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Examines Jaipur’s role as a coloured stone cutting and jewellery manufacturing centre, with profiles of 17 companies and their factory, trading and retail operations.
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Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
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GIA researchers analysed more than 90,000 natural pink diamonds to better understand how these rare and beautiful diamonds formed and got their colour.
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A bangle is an example of the misconception that B jade is only impregnated by resin, when in fact wax-impregnated jadeite is also considered B-jade.
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A jade bracelet contains unusual fillers, used to create a smooth surface.
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The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.
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Properties of, and theories on colour zoning exhibited by, the largest HPHT-treated blue diamond graded by GIA.
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A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.
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