GE announces it will be marketing a line of high pressure, high temperature treated yellowish green diamonds through Pegasus Overseas Limited .

Exposure to high temperature and high pressure changes the color of select  brown or brownish yellow body color diamonds into a yellowish green to greenish yellow diamonds.  The process creates an optical center that is thought to produce the vibrant color.

In addition to a change in color these diamonds tend to exhibit strong fluorescence when exposed to long-wave ultraviolet radiation.