Get to know all you need about diamond – the history, facts, quality factors, treatments, imitations and much more here at GIA.

The GIA Diamond Cut Grading System, introduced in 2005 after years of extensive research, assigns one of five grades to describe the overall cut quality of a standard round brilliant …

GIA’s Gem Encyclopedia is a virtual journey through the science and lore of gemstones from across the globe. Each precious stone page features additional detailed gemological …

Observations of Oval-, Pear-, and Marquise-Shaped Diamonds: Implications for Fancy Cut Grading. Presents findings from observations of oval-, pear-, and marquise-shaped diamonds, …

Diamond professionals use the grading system developed by GIA in the 1950s, which established the use of four important factors to describe and classify diamonds: Clarity, Color, Cut, and …

When shopping for a diamond, you may hear a jeweler refer to a diamond’s weight in points, calling a diamond that weighs 0.25 carats a “twenty-five pointer.” Diamonds that weigh more …

Apr 3, 2014 · Rough diamonds have become so popular that they’re showing up as center stones in engagement rings – traditionally the domain of polished, faceted beauties. These modern …

Diamonds have a long history as beautiful objects of desire. In the first century AD, the Roman naturalist Pliny stated: “Diamond is the most valuable, not only of precious stones, but of all …

Get to know all you need about diamond – the history, facts, quality factors, treatments, imitations and much more here at GIA. Gem Encyclopedia Birthstones

Diamond – Neutron and electron radiation are the most common forms of artificial irradiation, and it is possible to induce black, green, blue green, deep yellow, orange, pink and red diamonds …