Aaron is also an actor and stay-at-home dad, which means coffee is his friend. The Righteous Gemstones, the HBO original series about a world-famous (and quite dysfunctional) televangelist family ...

A look at the history of analytical instruments used for gem testing. UV-Vis-NIR spectroscopy measures how gemstones absorb and interact with light across the ultraviolet, visible, and near-infrared ...

As of 10:13:04 a.m. EDT. Market Open.

Welcome to GIA. Students around the globe turn to GIA for the knowledge, skills, and credentials that launch successful gem and jewelry careers. Through research, education, and unbiased gem grading ...