The “Type” Classification System of Diamonds and Its Importance in Gemology
Knowledge of type allows gemologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.
Summer 2009 G&G Lab Notes
This section, from the Summer 2009 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
Characterization of Peridot from Sardinia, Italy
Gem-quality peridot is occasionally found as mantle xenoliths within basalts near Pozzomaggiore.
Natural-Color Purple Diamonds from Siberia
Twelve natural-color purple diamond crystals from Siberia were studied using spectroscopic methods to better understand their color and its causes.
Hackmanite/Sodalite from Myanmar and Afghanistan
Significant amounts of gem-quality sodalite/hackmanite—some unusually transparent—have been produced.
Identification of the Endangered Pink-To-Red Stylaster Corals by Raman Spectroscopy
All corals within the Stylasteridae family (including the Stylaster genus) are listed in Appendix II of CITES.
Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique
Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink color were examined for this report.


.jpg)


