Investigates the presence of fluorescence, rather than iridescence, as the cause of color in blue amber from the Dominican Republic and Indonesia.

Examines the history of diamond production in Botswana and the long-term outlook for beneficiation through value-added industries.

The role of three-phase inclusions in emerald, combined with spectroscopy and trace-element analysis, in determining geographic origin.

Amber samples were heat-treated, using various procedures and parameters, in an effort to reproduce materials found in the jewelry market.