The 424-gem watch is adorned with 224 baguette-cut yellow sapphires to create a smooth surface that wouldn't be possible with brilliant-cut gems. An invisible setting technique ensures that there ...

The Geometeer, a synthetic ruby cut in a hybrid Portuguese-brilliant design, is dedicated to Rex Guo's mathematics professor and mentor, Dr. Timothy Poston. Photo by Rex Guo. Deciding how to cut a ...

A public benefit, nonprofit institute, GIA is the leading source of knowledge, standards, and education in gems and jewelry. Welcome to GIA. Students around the globe turn to GIA for the knowledge, ...