Research & News
Zircon in Jadeite Jade
A doubly terminated zircon inclusion survives multiple treatments in a translucent bangle of jadeite jade.
GIA Knowledge Sessions
Engage in webinars on the most diverse and pressing issues in gemology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemology.
Spectral Analysis of Resin Imitation Ivory
Spectroscopic techniques prove key in separating resin-based imitation ivory from natural ivory.
Uncommon Inclusion of Lazurite in Ruby from Mogok, Myanmar
Bright blue lazurite, identified by Raman spectroscopy, is a rare inclusion in a Mogok ruby.
Large Type IIa Diamond from Arkansas, USA
A surprising find from Crater of Diamonds State Park reveals a natural diamond remarkable in both size and clarity for its U.S. origin.
What Have Diamond Ages Taught Us?
Diamond ages offer insight into continent evolution spanning billions of years.