The booklet “Changing the Color of Diamonds Through High Pressure High Temperature” by EGL researchers Branko Deljanin and Gregory Sherman sold out of its first printing and is into its second. The booklet covers the HPHT process and deals with identification of HPHT type Ia diamonds using UV-visible spectrophotometers and FTIR infrared equipment. For more information call (212) 730-7380, extension 214.