Research Article Search Results

This article provides an overview of the history of natural and cultured pearls from Mexico, describes pearl culturing at the Guaymas farm, and focuses on the properties of bead-nucleated cultured pearls from P. sterna.

This article presents information about the CVD process, the history of its development, and properties that differentiate the resulting synthetic crystals from natural diamond.

Brown-to-gray and near-colorless single-crystal type IIa synthetic diamonds grown using a chemical vapor deposition (CVD) technique by Apollo Diamond Inc. have gemological properties that are distinct from those of both natural diamonds and HPHT-grown synthetic gem diamonds.

The heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.

The stories behind seven strikingly beautiful rare natural diamonds, united in an exhibit at the Smithsonian, are told here.

This article chronicles the discovery of primary diamond deposits throughout Canada, whose increasing supply of rough stones will have a growing impact on the world diamond industry.

A relatively new production of red corundum, reportedly from Bangkok, has been offered for sale in recent years.

Although the Pinctada margaritifera oyster usually is associated with the black pearls cultured in French Polynesia, it also can produce attractive large yellow cultured pearls, among other colors.

This article presents the first complete gemological characterization of the historic 128.48 ct Brazilian diamond known as the Star of the South.

This second major article in a three-dimensional modeling study analyzes fire – the visible extent of light dispersed into spectral colors.