Gemworld International, Northbrook, Ill., publishers of the gem pricing book The Guide, has announced the opening of a new diamond grading laboratory that will focus on all “four Cs,” using new ray tracing computer technology to help grade light return and cut quality.

Richard Drucker, owner of Gemworld and president of Gemworld International Laboratories (GIL), says the lab will use ray-tracing software developed by Diamond Technologies Inc., providing information on brilliance, fire, scintillation, and efficiency of light, which combine to create a “Light Return Index.” GIL will provide not only clarity, color, and carat weight but also a cut quality index and a final cut grade.

Gemworld International Laboratories is slated to open in New York on June 28. For more information, see Richard Drucker at booth Foyer 231 or call (212) 354-5185.

JCK