Research Article Search Results

A 7.54 ct natural emerald containing a 3D helical inclusion is examined by the Tokyo laboratory.

The interior structures of pearls are always of interest, as they are never revealed until the analysis begins.

Topaz is an important gemstone that occurs in various colors.

Examines the basic characteristics of kimberlites and their relationship with diamonds.

Two pearls presented a unique challenge, as testing at three different gemological laboratories could not conclusively identify them as natural or cultured, determine a freshwater or saltwater growth environment, or specify the producing mollusk.

Although opals generally contain water in their structure, fluid inclusions large enough to be resolved with the microscope are rare; those that can be seen with the unaided eye are exceedingly rare.

The appearance of curved banding under short-wave UV easily identifies flame-fusion synthetic sapphire.

Provides a visual guide to the internal features of natural, treated, synthetic, and imitation opal.

Twelve pink sapphires undergo low-temperature heat treatment and reveal a correlation with the 3232 cm-1 FTIR peak.

Reviews the mining history, market impact, and properties of ruby from northern Mozambique near Montepuez, now the world’s most productive source.

Shows how the color of Madagascar sapphire is lightened with heating to relatively low temperatures below 1350°C.

Reveals new details about this historical jewel and the results of its first gemological analysis.