Testing gold jewelry

I am trying to find a commercial lab that can perform X-ray
fluorescence tests of gold jewelry to determine karat content. Does
anyone have any suggestions?

Thank you.
Maxwell S. Peltz
Chavez & Gertler LLP
42 Miller Ave.
Mill Valley, CA 94941
(415) 381-5599
@Max_Peltz
www.chavezgertler.com