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Alexandrite

Tsarstone collectors guide

Strong Change Natural Alexandrite 13.55cts.

Dark green-violet-brown in daylight and red under incandescent light, the color change is strong. For an alexandrite, the stone is quite clean and well cut. Alexandrites this large are very rare.

Strong Change Natural Alexandrite 13.55cts.
Natural Alexandrite Oval 13.55 cts Natural Alexandrite Oval 13.55 cts

Grade Score 8 / 10

Color
Very good (4/5)
Cut
Fair (2/5)
Carat
Very large (5/5)
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*8/2 (very dark very strongly bluish green)
Phenomena: Change of color (Alexandrite effect) Pleochroism Strong
Color phenomena: stpR 6/4 (medium dark strongly purplish red)
Clarity
Clarity type: Eye clean (Type I)
Transparency: Transparent
Cut
Shape: Oval
Cut style: Step
Symmetry: Fair
Brilliance: Good
Polish: Exceptional
Size
Width: 12.40 mm
Length: 14.20 mm
Depth: 9.50 mm
Weight: 13.55 cts
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Bibliographic details
Page title Natural Alexandrite Oval 13.55 cts
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 03 July 2010 05:06 UTC
Date accessed 04 October 2024 13:00 UTC
Permanent link http://www.alexandrite.net/viewpage.html?id=ALX-001-00009
AMA style
David Weinberg. "Natural Alexandrite Oval 13.55 cts". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 05:06 UTC. Available at: http://www.alexandrite.net/viewpage.html?id=ALX-001-00009. Accessed October 04, 2024.
APA style
"Natural Alexandrite Oval 13.55 cts". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 13:00, October 04, 2024, from http://www.alexandrite.net/viewpage.html?id=ALX-001-00009.
Bluebook style
"Natural Alexandrite Oval 13.55 cts", http://www.alexandrite.net/viewpage.html?id=ALX-001-00009 (last visited October 04, 2024).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Natural Alexandrite Oval 13.55 cts", http://www.alexandrite.net/viewpage.html?id=ALX-001-00009 (Extremely rare Alexandrite (Chrysoberyl) Oval 13.55cts from Tanzania (Tunduru)) (as of Oct. 04, 2024, 13:00 GMT).
CBE/CSE style
David Weinberg. "Natural Alexandrite Oval 13.55 cts". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 05:06 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 05:06 UTC [cited 2024 Oct 04]. Available from: http://www.alexandrite.net/viewpage.html?id=ALX-001-00009.
Chicago style
David Weinberg, "Natural Alexandrite Oval 13.55 cts", http://www.alexandrite.net/viewpage.html?id=ALX-001-00009, (accessed October 04, 2024).
MLA style
"Natural Alexandrite Oval 13.55 cts". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 05:06 UTC. 04 Oct 2024 http://www.alexandrite.net/viewpage.html?id=ALX-001-00009
MHRA style
David Weinberg, "Natural Alexandrite Oval 13.55 cts", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 05:06 UTC, http://www.alexandrite.net/viewpage.html?id=ALX-001-00009 [accessed 04 October 2024].
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