Fossilized specimens discovered near St. Petersburg, Florida, provide unique insights into ancient mollusks.

Mysterious fibrous inclusions displaying chatoyancy are discovered in an opal with probable Mexican origin.

RusGems creates striking synthetic bicolor gems using the flame-fusion technique.

Discovered in the Italian Alps, a new mineral species of tourmaline has been named for Dr. Barbara Dutrow in honor of her teaching and research contributions to the field.

A large, lustrous natural freshwater pearl was displayed by the American Pearl Company at this year’s AGTA show.

An untreated blue sapphire rough and a faceted light teal blue sapphire, both of exceptional quality, add to the long-running reputation of Rock Creek for producing beautiful gems.

An exhibit featuring replicas of extraordinary diamonds won GIA’s museum the top awards from two gemology and mineralogy professional groups.

When a coating is removed, a carved piece of jadeite jade reveals that it is actually a doublet incorporating the similar-looking material known as serpentine.

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.

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

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.