- Established in 1931, GIA is an independent nonprofit that protects the gem and jewelry buying public through research, education and laboratory services.
- vpr-ege.ru oge/160-oge-2018-ofitsialnyj-sajt
- web.archive.org web/20200730043808/http://gia.edu…The Wayback Machine - https://web.archive.org/web/20200730043808/http://gia.edu.ru/ru/.
- obrnadzor.gov.ru gia/gia-9/
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