General Questions:
1-800-421-7250
Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
Read More
G&G Brief presents an overview of the content of the Winter 2015 issue of Gems & Gemology.
Read More
Everyone would agree that exposure and focus are the most critical aspects to consider when photographing gems or jewellery. But there are two other practices that take this kind of photography even further: lighting and positioning of the gem or jewel. The first component ensures a successful photograph. The second makes a picture interesting – or even compelling.
Read More
G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.
Read MoreThis article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.
Read MoreAn overview of the potential effects that heat treatment can have on corundum.
Read MoreThe first substantiated identification of corundum (var. ruby) occurring as an inclusion in natural diamond is presented.
Read MoreA review of heat treatment methods available for use on natural or synthetic corundum.
Read More
This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read More
During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges.
Read More
