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AMA style

David Weinberg. "Definition of Birthstone". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 04:47 UTC. Available at: http://m.alexandrite.net/viewpage.html?id=GG-087-00003. Accessed May 21, 2026.

APA style

"Definition of Birthstone". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 19:31, May 21, 2026, from http://m.alexandrite.net/viewpage.html?id=GG-087-00003.

Bluebook style

"Definition of Birthstone", http://m.alexandrite.net/viewpage.html?id=GG-087-00003 (last visited May 21, 2026).

Bluebook: Harvard JOLT style

See Alexandrite Tsarstone Collectors Guide, "Definition of Birthstone", http://m.alexandrite.net/viewpage.html?id=GG-087-00003 (A gemstone that has been associated, by superstitions and religious tradition as appropriate to the time or month of one's birth. There are also birthstones for days, hours, signs of the zodiac, and seasons. Also called natal-stone.) (as of May. 21, 2026, 19:31 GMT).

CBE/CSE style

David Weinberg. "Definition of Birthstone". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 04:47 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 04:47 UTC [cited 2026 May 21]. Available from: http://m.alexandrite.net/viewpage.html?id=GG-087-00003.

Chicago style

David Weinberg, "Definition of Birthstone", http://m.alexandrite.net/viewpage.html?id=GG-087-00003, (accessed May 21, 2026).

MLA style

"Definition of Birthstone". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 04:47 UTC. 21 May 2026 http://m.alexandrite.net/viewpage.html?id=GG-087-00003

MHRA style

David Weinberg, "Definition of Birthstone", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 04:47 UTC, http://m.alexandrite.net/viewpage.html?id=GG-087-00003 [accessed 21 May 2026].