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Opal with six-rayed star
Star Opal

An opal featuring a rare six-rayed star is examined in GIA's Bangkok lab.

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Summer 2012 G&G Lab Notes

This section, from the Summer 2012 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Summer 2007 G&G Lab Notes

This section, from the Summer 2007 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Summer 2003 G&G Lab Notes

This section, from the Summer 2003 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Summer 1987 G&G Lab Notes

This section, from the Summer 1987 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Summer 1986 G&G Lab Notes

This section, from the Summer 1986 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Summer 1985 G&G Lab Notes

This section, from the Summer 1985 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Summer 1983 G&G Lab Notes

This section, from the Summer 1983 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Optical opal structure
Summer 1982 G&G Lab Notes

This section, from the Summer 1982 issue of Gems & Gemmology, is a compilation of interesting finds from GIA's laboratories.

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Summer 1981 G&G Lab Notes

This section, from the Summer 1981 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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