This 1925 photo taken at the Green Vaults by Rosch and Krumbhaar shows crown and pavilion views of the Dresden Green, along with a 17-ct drilled briolette-cut colorless diamond and a …

The diamond type classification system is widely used in diamond research, because it provides a convenient way to categorize diamonds based on their chemical and physical properties.

GIA Laboratory graders visually assess girdle thickness at 10X magnification with the diamond in profile view, and consider each of the 16 valley positions and their thicknesses relative to the …

This carbon phase diagram illustrates the diamond-graphite stability field (defined by the dashed red equilibrium line) and the plastic yield limit of diamond (solid blue line).

As creator of the 4Cs and the International Diamond Grading System,TM GIA is the global authority and trusted source for unbiased diamond quality assessment. This guide is devoted …

Perfect diamond octahedrons are among the most striking of all mineral crystals. A well-shaped, transparent, octahedral diamond crystal with sharp, square edges is called a glassie.

The diamond deposits of Borneo are believed to share with India the distinction of being the earliest worked diamond mines in the world (see box), although researchers have not been …

The most critical stage in diamond manufacturing, marking the diamond for sawing or cleaving, requires a complex decision-making process to optimize the value of the finished stones.

This overview summarizes the two diamond growth processes: high-pressure, high-temperature (HPHT) and chemical vapor deposition (CVD). It explores the major trends observed by GIA …

Illustrates the GIA Cut grades and their relative position in the GIA Diamond Cut Grading System. Available for standard round brilliant cut diamonds in the D-to-Z color range and Flawless-to-I …