The New York lab discovers synthetic moissanite in a colored diamond bracelet.

A look at an unusual saltwater bead cultured pearl consisting of two parts.

A CVD-grown diamond submitted to GIA requires very careful examination to determine its origin.

A rare observation of spatially distinct red and greenish blue phosphorescence in a natural diamond.

An iridescent crystal with a stress halo is observed in a light brown diamond.

Examination of a round brilliant diamond reveals twinning wisps in the formation of a whale.

Examination of a Zambian emerald reveals prismatic black tourmaline inclusions.

An overview of one of the premier international jewelry trade shows in western Japan.

GIA’s Mumbai laboratory reports on a study of 988 reportedly “Venezuelan pearls.”

Crystal inclusions in a natural diamond resemble a unique scene.

Gem-quality bright blue to green “Paraíba”-type Cu-bearing tourmaline is now known from deposits in Africa (Nigeria and Mozambique), in addition to three commercial localities in Brazil (in Paraíba and Rio Grande do Norte States).

Well-formed crystals of green tourmaline from northwestern Zambia show a growth pattern reminiscent of trapiche emerald/ruby when sliced perpendicular to the c-axis.

Vietnamese aquamarine is notable for its attractive color and well-formed crystals.

An overview of ruby mining in the southern Indian states of Tamil Nadu and Karnataka.

The natural-color oolitic opal is the largest of its type examined by GIA.

An overview of natural