An opaque carving was identified as color-coated corundum based on visual features, as RI and SG could not be measured because of the piece’s large size.

Examination of a 0.40 ct near-colorless round brilliant diamond with a large inclusion resembling a dumbbell

Mines in San Benito County, California, produce andradite in various colors; some are chatoyant.

This article identifies some simple techniques for cooling gems that are available to the jeweler-gemologist.

This article describes the components and operation of the laser saw and its usefulness in diamond cutting.

Introducing a new technique in diamond cutting that virtually eliminates the

The author examines the gemological properties of Chatham flux-grown synthetic orange sapphires and blue sapphires.

Natural and synthetic emeralds are studied to identify the chemical differences between them.

Fascinating photomicrographs of inclusions in Sri Lankan taaffeites.

Demantoid garnet plays host to crystals of a different garnet species.

Arrays of hexagonal particle inclusions resemble a trapiche pattern in this natural sapphire.

Vibrant green uvarovite garnet in a white prehnite matrix with lapidary potential discovered in the Philippines.

Two new deposits of Cu-bearing tourmaline have been found in Paraíba State, Brazil, not far from the original source at Mina da Batalha.

Over the past 15 years a combination of market forces, environmental events, and scientific research has radically changed the cultured pearl industry.

There have been a number of changes in Ammolite production from southern Alberta, Canada, since 2001.