The American Society of Appraisers (ASA) - is an appraisal organization representing all of the disciplines of appraisal specialists.  ASA is dedicated to the benefit of the appraisal profession. www.appraisers.org

Federal Trade Commission (FTC) www.ftc.gov (enter jewelry in the search panel for various helpful links).

Gemological Institute of America (GIA) was established in 1931 and is the worlds largest and most respected nonprofit institute of gemological research and education. www.gia.edu

International Society of Appraisers (ISA) - is a not-for-profit organization formed to produce highly qualified and ethical appraisers. www.isa-appraisers.org

Lightning Ridge Opal – miner, cutter, supplier of opal www.opalguy.com