Accredited gemological laboratory for the identification and appraisal of diamonds, gemstones and items of jewelry 

Jewelry, gemstones, and diamond consignments

Expert witness and consultations

Christina Harrington, Master Gemologist Appraiser and Accredited Senior Appraiser, American Society of Appraisers. 

Gemological laboratory established in 1982.


Clientele includes the general public, law, banking and insurance firms, various governmental agencies as well as the jewelry trade (retailers, wholesalers and manufacturing jewelers). In addition to identifications and appraising, technical consultations and expert witness services. 

Consignment services are also provided serving the needs of fiduciaries in the disposition of large and small estates


A portable laboratory is available for use in out-of-office assignments. An extensive library is maintained containing a large selection of technical and historical reference works and trade publications dealing with all phases of gemology and related subjects as well as contemporary and antique jewelry.