General Questions:
1-800-421-7250
This article, from the Spring 1994 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read More
Emerald is the green to greenish blue variety of beryl, a mineral species that also includes aquamarine as well as beryls in other colours.
Read MoreRuby is the most valuable variety of the corundum mineral species, which also includes sapphire.
Read MorePerhaps the best-loved gems of all time, pearls—both natural and cultured pearls—occur in a wide variety of colours. Learn about the factors that make pearls so popular and desirable!
Read More
Webinars are an easy, informal way for GIA experts to share information and stay connected with the community of researchers and gem and jewellery lovers.
Read More
Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference
Read MoreAndy Lucas, GIA’s education manager of field gemmology, researches and documents the mine to market journey of gemstones. Lucas shares the changes he observed in Colombia’s major emerald mining and cutting areas in a presentation he gave at the 2017 JCK Las Vegas show.
Read More
Explores the usefulness of this technique in the mapping of defects and spectral features, the determination of colour origin, and the identification of synthetic and treated diamond melee.
Read More
Join GIA’s recent field expedition to the ruby rush in Madagascar’s Zahamena National Park.
Read More
