Opal was the focus of the April 2015 Sinkankas Symposium at GIA’s Carlsbad, California campus.

A synthetic colorless sapphires is tested to identify the source of its phosphorescence.

A natural type IIb diamond with rare color and very strong 776.4 nm PL peak is seen at the Carlsbad lab.

An unusual mite is preserved in a 30-million-year old amber specimen.