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Alexandrite

Tsarstone collectors guide

Certified Strong Change Alexandrite 21.23cts

Dark blue green in daylight and purple- red under incandescent light, the color change is strong and attractive. Although the clarity is not that good, alexandrites this large are extremely rare. An antique setting might be the best way to set this stone. The cutting and proportions are quite good.

Certified Strong Change Alexandrite 21.23cts
Natural Alexandrite Cushion 21.23 cts Natural Alexandrite Cushion 21.23 cts

Grade Score 7 / 10

Color
Very good (4/5)
Cut
Fair (2/5)
Carat
Very large (5/5)
Clarity
Fair (2/5)
Rarity
Extremely rare (5/5)

Price information

Availability information

Detail identification and grading report
Identification
Type: Natural
Species: Chrysoberyl
Variety: Alexandrite
Origin: Tunduru, Ruvuma, Ruvuma Region, Tanzania
Hardness: 8.5
Density: 3.75
RI-1: 1.741
RI-2: 1.76
Enhancements
Variety of work: Faceted
Designation: A (Not currently known to be enhanced)
Color
Color light source: Cool daylight
Color description: GB/BG*6/2 (medium dark green blue or blue green)
Phenomena: Change of color (Alexandrite effect) Pleochroism Strong
Color phenomena: RP/PR 5/3 (medium red-purple [pink])
Clarity
Clarity type: Severely included (Type I)
Transparency: Transparent
Cut
Shape: Cushion
Cut style: Step
Symmetry: Fair
Brilliance: Poor
Polish: Good
Size
Width: 11.90 mm
Length: 16.02 mm
Depth: 11.33 mm
Weight: 21.23 cts
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Bibliographic details
Page title Natural Alexandrite Cushion 21.23 cts
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 03 July 2010 05:05 UTC
Date accessed 17 January 2020 15:38 UTC
Permanent link http://www.alexandrite.net/viewpage.html?id=ALX-001-00002
AMA style
David Weinberg. "Natural Alexandrite Cushion 21.23 cts". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 05:05 UTC. Available at: http://www.alexandrite.net/viewpage.html?id=ALX-001-00002. Accessed January 17, 2020.
APA style
"Natural Alexandrite Cushion 21.23 cts". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 15:38, January 17, 2020, from http://www.alexandrite.net/viewpage.html?id=ALX-001-00002.
Bluebook style
"Natural Alexandrite Cushion 21.23 cts", http://www.alexandrite.net/viewpage.html?id=ALX-001-00002 (last visited January 17, 2020).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Natural Alexandrite Cushion 21.23 cts", http://www.alexandrite.net/viewpage.html?id=ALX-001-00002 (Extremely rare Alexandrite (Chrysoberyl) Cushion 21.23cts from Tanzania (Tunduru)) (as of Jan. 17, 2020, 15:38 GMT).
CBE/CSE style
David Weinberg. "Natural Alexandrite Cushion 21.23 cts". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 05:05 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 05:05 UTC [cited 2020 Jan 17]. Available from: http://www.alexandrite.net/viewpage.html?id=ALX-001-00002.
Chicago style
David Weinberg, "Natural Alexandrite Cushion 21.23 cts", http://www.alexandrite.net/viewpage.html?id=ALX-001-00002, (accessed January 17, 2020).
MLA style
"Natural Alexandrite Cushion 21.23 cts". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 05:05 UTC. 17 Jan 2020 http://www.alexandrite.net/viewpage.html?id=ALX-001-00002
MHRA style
David Weinberg, "Natural Alexandrite Cushion 21.23 cts", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 05:05 UTC, http://www.alexandrite.net/viewpage.html?id=ALX-001-00002 [accessed 17 January 2020].
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