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Alexandrite

Tsarstone collectors guide

Certified Natural Alexandrite Cushion 4.12cts

Yellowish green in daylight and grayish violet under incandescent light, the color change is strong. The stone is bright and quite clean and the cut and polish are good.

Certified Natural Alexandrite Cushion 4.12cts
Natural Alexandrite Cushion 4.12 cts Natural Alexandrite Cushion 4.12 cts

Grade Score 8 / 10

Color
Very good (4/5)
Cut
Good (3/5)
Carat
Large (4/5)
Clarity
Very good (4/5)
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: vstbG 5/3vstbG 5/3 (medium very strongly bluish green)
Phenomena: Change of color (Alexandrite effect) Pleochroism Strong
Color phenomena: RP/PR 5/3 (medium red-purple [pink])
Clarity
Clarity type: Slightly included (Type I)
Transparency: Transparent
Cut
Shape: Cushion
Cut style: Step
Symmetry: Good
Brilliance: Very good
Polish: Exceptional
Size
Width: 8.87 mm
Length: 9.18 mm
Depth: 5.78 mm
Weight: 4.12 cts
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Bibliographic details
Page title Natural Alexandrite Cushion 4.12 cts
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 03 July 2010 05:06 UTC
Date accessed 02 April 2020 06:53 UTC
Permanent link http://www.alexandrite.net/viewpage.html?id=ALX-001-00006
AMA style
David Weinberg. "Natural Alexandrite Cushion 4.12 cts". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 05:06 UTC. Available at: http://www.alexandrite.net/viewpage.html?id=ALX-001-00006. Accessed April 02, 2020.
APA style
"Natural Alexandrite Cushion 4.12 cts". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 06:53, April 02, 2020, from http://www.alexandrite.net/viewpage.html?id=ALX-001-00006.
Bluebook style
"Natural Alexandrite Cushion 4.12 cts", http://www.alexandrite.net/viewpage.html?id=ALX-001-00006 (last visited April 02, 2020).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Natural Alexandrite Cushion 4.12 cts", http://www.alexandrite.net/viewpage.html?id=ALX-001-00006 (Extremely rare Alexandrite (Chrysoberyl) Cushion 4.12cts from Tanzania (Tunduru)) (as of Apr. 02, 2020, 06:53 GMT).
CBE/CSE style
David Weinberg. "Natural Alexandrite Cushion 4.12 cts". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 05:06 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 05:06 UTC [cited 2020 Apr 02]. Available from: http://www.alexandrite.net/viewpage.html?id=ALX-001-00006.
Chicago style
David Weinberg, "Natural Alexandrite Cushion 4.12 cts", http://www.alexandrite.net/viewpage.html?id=ALX-001-00006, (accessed April 02, 2020).
MLA style
"Natural Alexandrite Cushion 4.12 cts". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 05:06 UTC. 02 Apr 2020 http://www.alexandrite.net/viewpage.html?id=ALX-001-00006
MHRA style
David Weinberg, "Natural Alexandrite Cushion 4.12 cts", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 05:06 UTC, http://www.alexandrite.net/viewpage.html?id=ALX-001-00006 [accessed 02 April 2020].
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