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Tsarstone collectors guide

Strong Color Change Alexandrite Cushion

Bluish green in daylight and purple red under incandescent light, the color change is exceptionally strong and attractive. The change is apparent without even changing the lights. Alexandrites this large are extremely rare and this is a special stone. Although the clarity is not that good, this is a stone with character and I would keep it if I could. An antique setting might be the best way to set this stone. The cutting and proportions are good and the price is right. $3000 /ct. is a steal for an alexandrite this large!

Strong Color Change Alexandrite Cushion
Natural Alexandrite Cushion 21.41 cts Natural Alexandrite Cushion 21.41 cts

Grade Score 10 / 10

Exceptional (5/5)
Exceptional (5/5)
Very large (5/5)
Exceptional (5/5)
Extremely rare (5/5)

Price information

Availability information

  • Offered through
  • Usually ships within 24 hours
  • Source:
  • Multicolour Gems Co., Ltd
Detail identification and grading report
Type: Natural
Species: Chrysoberyl
Variety: Alexandrite
Origin: Deobhog area, Raipur, Chhattisgarh, India
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*5/4 (medium very strongly bluish green)
Phenomena: Pleochroism Change of color (Alexandrite effect) Strong
Color phenomena: rP 5/3 (medium reddish purple)
Clarity type: Moderately included (Type I)
Transparency: Transparent
Shape: Cushion
Cut style: Step
Symmetry: Exceptional
Brilliance: Exceptional
Polish: Exceptional
Width: 14.50 mm
Length: 15.50 mm
Depth: 10.50 mm
Weight: 21.41 cts
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