16 CFR Part 23, Guides for the Jewelry, Precious Metals, and Pewter Industries; Project No. G711001 #00087

Submission Number:
00087
Commenter:
Michael Cowing
Organization:
Accredited Gemologist Association
State:
Maryland
Initiative Name:
16 CFR Part 23, Guides for the Jewelry, Precious Metals, and Pewter Industries; Project No. G711001
Before diamond grading reports became popular, there was a widespread preference in the trade for stones with blue fluorescence. These diamonds which sometimes appeared bluish in daylight due to stimulation of blue fluorescence by the ultra violet (UV) component contained in daylight were called "blue-white" diamonds. Some of these blue fluorescent diamonds retain a high white (GIA color grades D and E) appearance under artificial daylight balanced illumination that is absent fluorescence stimulating UV. Other blue fluorescent diamonds reveal a yellowish or brownish body color in illumination that is absent fluorescence stimulating UV, because the blue fluorescence was masking a yellowish or brownish body color. The intent of § 23.14 Misuse of the term "blue white" was to prohibit use of the term for diamonds having a yellowish or brownish body color in lighting where their blue fluorescence was not excited. Unfortunately, the current wording fails in this regard, because the "normal, north daylight" with its strong UV component is masking with blue fluorescence the yellowish or brownish body color : § 23.14 Misuse of the term "blue white" It is unfair or deceptive to use the term "blue white" or any representation of similar meaning to describe any diamond that under normal, north daylight or its equivalent shows any color or any trace of any color other than blue or bluish. The following proposed rewording fulfills the original intent: § 23.14 Misuse of the term "blue white." It is unfair or deceptive to use the term "blue white" or any representation of similar meaning to describe any diamond that, under artificial daylight balanced illumination, absent fluorescence stimulating UV, shows any color or any trace of any color (e.g. yellowish or brownish) other than blue or bluish.