2015 Sinkankas Symposium
Opal was the focus of the April 2015 Sinkankas Symposium at GIA’s Carlsbad, California campus.
An Unusual Filled Ruby
Phosphorescence of Synthetic Sapphire
A synthetic colorless sapphires is tested to identify the source of its phosphorescence.
Cat’s-Eye Calcite from Pakistan
Diamond-Bearing Eclogite Xenoliths from the Ardo So Ver Dykes
Mineralogical examination of diamond-bearing material from South Africa reveals the specimens to be eclogite xenoliths.