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Alexandrite

Tsarstone collectors guide

Gemological Institute of America

Provides grading and identification of diamonds, coloured stones or pearls for the industry and consumers.

GIA New York
Homepage Address Contact
www.gia.edu 580 Fifth Avenue
Suite 200
New York 10036
United States of America
N: Jan Tilton
T: 212-221-5858
F: 212-575-3095
E: laboratorycustomerservice@gia.edu

GIA is considered the world's most trusted name in diamond grading and gemstone identification. GIA’s D-to-Z colour-grading scale and Flawless-to-I3 clarity-grading scale are recognized by gem and jewellery professionals everywhere. And, by extension, the GIA Diamond Grading Report, Diamond Dossier, and Gemological Identification Report are considered the world’s premier gemological credentials.

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Bibliographic details
Page title Gemological Institute of America
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 12 August 2011 01:17 UTC
Date accessed 21 May 2026 18:34 UTC
Permanent link http://m.alexandrite.net/viewpage.html?id=WDD-003-00021
AMA style
David Weinberg. "Gemological Institute of America". In Alexandrite Tsarstone Collectors Guide. August 12, 2011, 01:17 UTC. Available at: http://m.alexandrite.net/viewpage.html?id=WDD-003-00021. Accessed May 21, 2026.
APA style
"Gemological Institute of America". (2011, August 12). In Alexandrite Tsarstone Collectors Guide. Retrieved 18:34, May 21, 2026, from http://m.alexandrite.net/viewpage.html?id=WDD-003-00021.
Bluebook style
"Gemological Institute of America", http://m.alexandrite.net/viewpage.html?id=WDD-003-00021 (last visited May 21, 2026).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Gemological Institute of America", http://m.alexandrite.net/viewpage.html?id=WDD-003-00021 () (as of May. 21, 2026, 18:34 GMT).
CBE/CSE style
David Weinberg. "Gemological Institute of America". In Alexandrite Tsarstone Collectors Guide. 2011 Aug 12, 01:17 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2011 Aug 12, 01:17 UTC [cited 2026 May 21]. Available from: http://m.alexandrite.net/viewpage.html?id=WDD-003-00021.
Chicago style
David Weinberg, "Gemological Institute of America", http://m.alexandrite.net/viewpage.html?id=WDD-003-00021, (accessed May 21, 2026).
MLA style
"Gemological Institute of America". Alexandrite Tsarstone Collectors Guide. 12 Aug 2011, 01:17 UTC. 21 May 2026 http://m.alexandrite.net/viewpage.html?id=WDD-003-00021
MHRA style
David Weinberg, "Gemological Institute of America", Alexandrite Tsarstone Collectors Guide, 12 August 2011, 01:17 UTC, http://m.alexandrite.net/viewpage.html?id=WDD-003-00021 [accessed 21 May 2026].
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