2015 Sinkankas Symposium
Opal was the focus of the April 2015 Sinkankas Symposium at GIA’s Carlsbad, California campus.
An Unusual Filled Ruby
Rare Type IIb Gray-Purple Diamond
A natural type IIb diamond with rare color and very strong 776.4 nm PL peak is seen at the Carlsbad lab.
Phosphorescence of Synthetic Sapphire
A synthetic colorless sapphires is tested to identify the source of its phosphorescence.