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GEMS & GEMOLOGY Winter 1999 n response to concerns expressed by members of the gem and jewelry industry regarding the use of organic fillers to enhance emeralds, GIA and the GIA Gem Trade Laboratory have been conducting an extensive study of fillers in emeralds. This research focuses on three major areas: (1) identification of the specific filler used in an emerald; (2) determination of the extent to which an emerald has been filled; and (3) examination of the response of different fillers over time and to normal conditions of wear, care, and manufacturing. The first area was addressed in the Summer issue of Gems & Gemology by Johnson et al. (1999); they concluded that distinctions can be made in some cases for “pure” fillers, but that the detection of one substance in a fissure does not prove that all others are absent. While research on the third item is still in progress, the present article reports the development of a method to determine the extent to which a particular emerald has been filled as an indication of the degree of clarity enhancement. Based on the results of this research, in early 2000 the GIA Gem Trade Laboratory will be offering a new emerald report that will describe the level of clarity enhancement in natural emeralds. We hope that this type of report will help dealer and retailer alike reestablish consumer confidence in emeralds (figure 1) by providing information needed to make an educated purchase decision. Although the GIA Gem Trade Laboratory is not the first gemological lab to offer such a report, we believe that this is the first article to reveal the materials, methodology, and results of the study on which a system for classifying the degree of enhancement in an emerald is based, as well as the general criteria used.

Classifying Emerald Clarity Enhancement at the GIA Gem Trade Laboratory