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