网上可以查到（Google）“AGI (ACCREDITED GEMOLOGICAL INSTITUTE)
Accredited Gemological Institute (AGI NY) is an independent diamond and jewelry appraisal service located at the center of the diamond district in New York City located at 37 W 47 New York, NY 10036. AGI NY appraisals are recognized by all major insurance companies. Their Appraiser Services include an in depth dexxion of your purchase which includes the four C's The Cut, The Color,The Clarity, The Carat weight along with the plot of inclusions, and an Estimated Retail Replacement Value. They also verify and match GIA certificates with the stones and offer appraisals for the verified items needed for insurance purposes. Their Appraisers are experienced GIA Graduates who are trained to provide the best service in a timely matter.” 按照这个介绍，这是纽约一家独立评估公司。看来信用资质都还可以，主要是为珠宝保险估价，得到大部分大的保险公司的认可。