Rare chromium-rich corundum inclusions in a natural gem diamond provide a window into the deep earth.

The Carlsbad laboratory recently identified a richly-hued green stone as clarity-enhanced glass.

An unusual series of graphitic cavities discovered on a star facet in a near-colorless round brilliant diamond may be explained by laser sawing.

The Carlsbad laboratory recently examined a 763.5 ct faceted grandidierite, the largest GIA has seen to date.

A vivid cobalt blue spinel from Vietnam contains the first reported inclusion of actinolite in spinel.

Faceted quartz contains numerous unusual white radial inclusions identified as bavenite.

In 2006, emeralds were discovered in the Fazenda Bonfim region of northeastern Brazil.

The Ferraccia Jewelry Collection exhibited a huge variety of stingray leather goods at the AGTA show, including bracelets, necklaces, earrings, rings, belts, purses, and mobile phone cases.

The New York lab recently examined several diamonds with an interesting variation on the cabochon.

GIA recently examined a rare orange diamond that demonstrated the complexity of diamond color origin.

This stone was a good example of a very rare natural diamond exhibiting synthetic growth characteristics.

Overview and commentary on the 2013 Russian Diamonds and Jewellery article “New Reality of the Russian Jewellery Market.”

A simplified form of X-ray topography can fingerprint faceted diamonds to aid in their recovery from loss or theft.

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.

A combination of trace-element analysis and UV-visible spectroscopy clearly indicated that the yellow color originated from the much more effective chromophore known as “trapped holes,” associated with the trace amount of Mg and Cr in this stone.