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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

Very good (4/5)
Fair (2/5)
Very large (5/5)
Fair (2/5)
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: 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 type: Severely included (Type I)
Transparency: Transparent
Shape: Cushion
Cut style: Step
Symmetry: Fair
Brilliance: Poor
Polish: Good
Width: 11.90 mm
Length: 16.02 mm
Depth: 11.33 mm
Weight: 21.23 cts
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