A coated Paraíba tourmaline is seen for the first time at a GIA lab.

Radiation-induced pink sleeves are seen in a rubellite cabochon.

An investigation into jewelry-grade phenakite from Russia.

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.

An exciting find reveals a pocket of exceptionally large and lustrous royal blue sapphire crystals in a town already known for these beautiful gems.

Silver-set pieces created from pink thulite as well as blue slag material from the Middle Ages demonstrate Scandinavian diversity and artistry in jewelry design.

GIA Library director Robert Weldon is recognized by a professional organization for his long service in the field of gemology.

Intriguing bicolor sapphires and spectacularly colored thin sapphire slabs are produced by mines in Rock Creek and Inverell, respectively.

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.