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Alexandrite

Tsarstone collectors guide


Spinel

Spinel
An isomorphous mineral of spinel group. A wide range of colors and shade of gemstone. Red-orange is named as flame spinel, an iron-rich dark-green to black, which is known as green spinel, pleonaste or ceylonite, grass-green as chlorospinel (iron-rich), brownish-black as picotite. Galaxite is a black ferrous oxide rich spinel, blue zinc-rich as gahnospinel, Nin is local term for black spinel from Thailand. Some specimen with prefix or suffix are erroneously named as ruby or sapphire such as fine red as ruby spinel (in Roman times as ballas ruby), and balas spinel or spinel sapphire. Misnomered are orange-yellow as rubicelle, almandine spinel. Another stone frequently misnomered as spinel such as Arizona spinel or Kandy spinel, both of which are garnet. Star spinel with 4 and 6-rayed stars are extremely rare. Cut as faceted gems in the brilliant cut, step cut, emerald cut, or mixed cut. Famous spinel gems are: over 500 cts., a stone in National Jewel Treasury of Iran, Black Prince's Ruby estimated 170 cts.
Bibliographic details
Page title Definition of Spinel
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 03 July 2010 04:46 UTC
Date accessed 09 April 2026 09:29 UTC
Permanent link http://w.alexandrite.net/viewpage.html?id=GG-104-00006
AMA style
David Weinberg. "Definition of Spinel". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 04:46 UTC. Available at: http://w.alexandrite.net/viewpage.html?id=GG-104-00006. Accessed April 09, 2026.
APA style
"Definition of Spinel". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 09:29, April 09, 2026, from http://w.alexandrite.net/viewpage.html?id=GG-104-00006.
Bluebook style
"Definition of Spinel", http://w.alexandrite.net/viewpage.html?id=GG-104-00006 (last visited April 09, 2026).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Definition of Spinel", http://w.alexandrite.net/viewpage.html?id=GG-104-00006 (An isomorphous mineral of spinel group. A wide range of colors and shade of gemstone. Red-orange is named as flame spinel, an iron-rich dark-green to black, which is known as green spinel, pleonaste or ceylonite, grass-green as chlorospinel (iron-rich), brownish-black as picotite. Galaxite is a black ferrous oxide rich spinel, blue zinc-rich as gahnospinel, Nin is local term for black spinel from Thailand. Some specimen with prefix or suffix are erroneously named as ruby or sapphire such as fine red as ruby spinel (in Roman times as ballas ruby), and balas spinel or spinel sapphire. Misnomered are orange-yellow as rubicelle, almandine spinel. Another stone frequently misnomered as spinel such as Arizona spinel or Kandy spinel, both of which are garnet. Star spinel with 4 and 6-rayed stars are extremely rare. Cut as faceted gems in the brilliant cut, step cut, emerald cut, or mixed cut. Famous spinel gems are: over 500 cts., a stone in National Jewel Treasury of Iran, Black Prince's Ruby estimated 170 cts. ) (as of Apr. 09, 2026, 09:29 GMT).
CBE/CSE style
David Weinberg. "Definition of Spinel". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 04:46 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 04:46 UTC [cited 2026 Apr 09]. Available from: http://w.alexandrite.net/viewpage.html?id=GG-104-00006.
Chicago style
David Weinberg, "Definition of Spinel", http://w.alexandrite.net/viewpage.html?id=GG-104-00006, (accessed April 09, 2026).
MLA style
"Definition of Spinel". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 04:46 UTC. 09 Apr 2026 http://w.alexandrite.net/viewpage.html?id=GG-104-00006
MHRA style
David Weinberg, "Definition of Spinel", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 04:46 UTC, http://w.alexandrite.net/viewpage.html?id=GG-104-00006 [accessed 09 April 2026].
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