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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

Very good (4/5)
Fair (2/5)
Very large (5/5)
Very good (4/5)
Extremely rare (5/5)

Price information

Availability information

Detail identification and grading report
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
Variety of work: Faceted
Designation: A (Not currently known to be enhanced)
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 type: Eye clean (Type I)
Transparency: Transparent
Shape: Oval
Cut style: Step
Symmetry: Fair
Brilliance: Good
Polish: Exceptional
Width: 12.40 mm
Length: 14.20 mm
Depth: 9.50 mm
Weight: 13.55 cts
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