Examines gem-quality cassiterite from southwest China and analyzes trace element chemistry to distinguish it from Bolivian cassiterite.

A natural faceted diamond displays a prominent square-shaped cloud under the table.

Provides a visual guide to the internal features of tourmaline as well as tourmaline inclusions in other gem hosts.

Reviews the advancements and major trends in laboratory-grown diamonds observed by GIA since 2007.

A GIA student from the New York campus receives recognition for a necklace design featuring diamonds, lavender jade, and akoya pearls.

Dr. Rodney Ewing, a member of the GIA Board of Governors from 2006 to 2015, passed away earlier this month at age 77.

Dr. Rodney Ewing, a member of the GIA Board of Governors from 2006 to 2015, passed away earlier this month at age 77.

Members of the first class to complete the GIA Graduate Gemologist® program in New York City gathered.

Learn the latest on Madagascar sapphires and demantoid garnets from Wim Vertriest, GIA Manager of Field Gemology.

Experience the world of gemology in person with GIA at Couture and JCK Las Vegas.

Experience the world of gemology in person with GIA at Couture and JCK Las Vegas.

An overview of the Spring 2024 Gems & Gemology content.

Several vendors offered a variety of impressive non-nacreous pearls at the Tucson gem shows.

A CVD-grown diamond exhibits an interesting clarity characteristic.