Laboratories in USA

(GIA) Gemological Institute of America
(GTL) Gem Trade Laboratory:

Address:
Robert Mouawad Campus, 5355
Carlsbas, CA 92008-4699
USA
Tel: 800 421-7250
Fax: 760 603-4550
Locations: Carlsbad, New York, Hong Kong, Italy,
Tokyo, Osaka, Seoul, Los Angeles, Moscow,
Taiwan, Thailand.
Owner:
GIA
Specialization:
Diamond grading, origin reports, gemstone identi-
fication, education.
Special Equipment:
Refractometer, Polariscope, Thermal Probe, Ultra_
violet Visible Spectrophotometer, Laser Raman
Microspectrometer, Energy Dispersive X-ray
Fluorescence Chemical Analysis System, X-ray
Powder Diffraction Camera.
Services Offered:
Diamond grading, diamond master color comparison
grading, colored diamond grading, colored diamond
identification and origins, gemological identification,
pearl identification, laser inscription.
Certificate/Report:
Shape, measurements, weight, proportions, clarity,
color, plot, polish and symmetry for diamonds. Gem
identification and color grading.
Educactional Programs:
Diamond Essentials, Diamonds, Diamond Grading,
Colored Stone Grading, Jewelry Display, Fine Jewe-
lry Sales, Advanced Fine jewelry Sales, Pearl & Bead
Stringing, Gold & Precious Metals, Insurance Repla-
cement appraisl, Counter Sjrtching; jewelry Design,
Jewelry Repair & Setting.
(DPL) Diamond Profile Laboratory, Inc:
Address:
36 N.E. First St., #429
Miami, Fl 33132
USA
Tel: 305 577-6090 or 800 991-2378
Fax: 305 577-6017
E-mail: diapro@bellsouth.net
Specialization:
Light return, cut grading.
Services Offered:
Diamond grading, identification of colored stones.
Certificate/Report:
Cert includes color, clarity scale, cut grade, origin
and enhancement information.
























(GQI) Gem Quality Institute, Inc.:
Address:
5 South Wabash St., #1905
Chicago Illinois 60603
USA
Tel: 312 920-1541
Fax: 312 920-1547
Locations: 550 South Hill St. #1595
los Angeles CA 90013 USA
Tel: 213 623-8092 Fax: 213 622-3138
Owner:
Tom and Myriam Tashey
Specialization:
Reports of quality on diamonds and colores Stones.
Special Equipment:
Sarin Diamension, Gran colorimeter.
Services Offered:
Certs, consultations, mini-reports, grading reports
(for mounted goods), verbals. Free identification of
treated diamonds and diamond simulants (CZ, mo-
issannite).
Certificate/Report:
Color, clarity scale, cut grade for diamonds. Origins,
enhancement, identification for colored stones. Also
quality analysis of colored stones.
Educactional Programs:
Seminars on current issues, classes on practical
grading of diamonds and colored stones. No certi-
fication programs.







 

 

 

 

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Email: info@colorstones.com