Research & News
Six-Rayed Star in Sapphire from Myanmar
A Burmese sapphire shows a celestial scene both externally and internally.
2018 GIA Symposium
Scientists and business leaders will gather at a summit of the gem and jewelry industry.
Unusual Orange Pyrope-Spessartine-Grossular Garnet
A garnet proves to have a much higher grossular component than initially expected.
Opal with Agate-Like Banding
An orangy brown opal from Ethiopia displays a small patch of wavy "varve" banding, unusual for this type of gem.
Irradiated and Annealed Blue Type Ia Diamond
Examination shows that a diamond was subjected to a multi-step process in order to introduce a blue color.
Cat's-Eye Demantoid and Andradite with Horsetail Inclusions
Two unusual garnets receive identifications issued for the first time in GIA's colored stone report records.