About International Gemological Services

Sindi J. Schloss, GG

Sindi Schloss is founder & president of International Gemological Services — a full service, independent jewelry appraisal firm & School of Gemology which began in 1983.


Sindi Schloss, GG

Uniform Standards of Professional Appraisal Practices Course – October 2012

International Society of Appraisers Certified Appraiser of Personal Property (CAPP) courses:

  • Appraisal Ethics and Business Practices – Oct. 1991
  • Appraisal Methodology and Report Writing – Oct. 1991
  • Fiduciary Responsibilities and Liabilities – Oct. 1991
  • Advanced Appraisal Theory and Report Writing – Dec. 1992
  • Expert Witness and Trial Consultant – Dec. 1992
  • Appraisal of Gems and Jewelry – Feb. 1992

Gemological Institute of America (G.I.A.) Certificates and Courses:

  • GIA Graduate Gemologist (includes Diamond Certificate, Colored Stones and Colored Stone Gem
  • Identification certificates) – May 1985
  • Colored Stone Grading Course
  • Pearl Course and Certificate – April 1987
  • Advanced Spectroscopy seminar
  • Synthetic vs. Natural Amethyst Detection seminar, Clarity Enhanced Diamond seminar, Treatment and
  • Synthetics seminars
  • Continuing Education Seminars


1983 to present, founder and owner of International Gemological Services, a center with divisions for gemological education and training, jewelry appraisals and gemological service for trade and retail customers, Scottsdale, Arizona.

1998 to March 2011, former The Bead Museum, Glendale, Arizona

  • Chair of exhibitions committee and board member
  • Curation, installation and loaned collection for exhibitions pertaining to human adornment

2012 to present, 1997-2005: G.I.A. Metro Phoenix Chapter Alumni Association president

  • Regional Chapter of the Year Award – 1997
  • Regional Member of the Year Award – 1997
  • Regional Member of the Year Award – 2000

1990- 1998, Arizona Jeweler’s Association Education Chairman

14 years: assisting colored gemstone vendors in display and sales at Tucson Gem & Mineral shows, trunk shows

8 years: inventory controller for a large wholesale colored stone supply house in Denver, Colorado. Position involved sorting and grading cut gemstones, preparing and placing them into store and salespersons inventories; inventory maintenance and sales.

6 years: Assistant professor in Geology at Auraria Campus (University of Colorado, Metropolitan State College & Denver Community College), courses in gemology

8 months: Gemological and appraisal internship in Richmond, Virginia; specializing in period and contemporary jewelry

International travel to assist in colored stone buying and gemological expertise, including numerous Southeast Asian trips (e.g. India, Thailand, Hong Kong, Malaysia, Singapore, Sri Lanka); Kenya, Africa; Israel, Egypt, Brazil, extensive European travel.

International & domestic travel to gem, jewelry & ethnographic trade shows for price, product and market data collection.

Special Expertise

Course instructor in Diamonds and Diamond Grading, Beginning to Advanced courses in Colored Stones and Colored Stone Identification and The History of Human Adornment, as well as special topic seminars (pearls, jade, etc.)

Speaker to gemological and jewelry professional organizations, rock and minerals groups, bead societies, museums, jewelry stores and various collectibles and special interest groups.

Article submissions for newsletters, trade journals, guest editor for books relating to gemology and appraisals

Judge for professional jewelry association design awards and juried festivals

Professional Organizations

Associate Member of International Society of Appraisers (I.S.A.)

Diploma Member of G.I.A. Alumni Association

Charter Member of National Association of Jewelry Appraiser (N.A.J.A.)

Accredited Gemologist Association (A.G.A.) Accredited Senior Gemologist

Association of Women Gemologists – Recipient of 1990 Diamond in the Rough Award for excellence in gemology

The Bead Museum – Recipient of the Gabrielle Liese Spirit Award – March 2007

Member of The American Society of Jewelry Historians