Sapphire
Ceylon Grey-Blue Star Sapphire
- Origin
- Ratnapura
- Carat
- 8.40 ct
- Colour
- Greyish Blue
- Certificate
- NGJA
$12,200
Quick view
Cushion Mixed Cut · Bluish Green to Purplish Red
AlexandriteColour Change
Ceylon Alexandrite
Emerald by day, ruby by night — a Ceylon alexandrite with a strong, complete colour change.
Price on request
Reserved · 1.85 ct
Specifications
- Gem type
- Alexandrite · Colour Change
- Carat weight
- 1.85 ct
- Origin
- Ratnapura, Sri Lanka
- Colour
- Bluish Green to Purplish Red
- Cut
- Cushion Mixed Cut
- Clarity
- Slightly Included
- Treatment
- Unheated
- Dimensions
- 7.12 × 6.48 × 4.35 mm
- Certification
- Gübelin · GUB-26014477
- Report issued
- 2 March 2026
The stone
Alexandrite changes colour because chromium sits in a crystal structure that transmits both green and red light; the eye resolves whichever the light source favours. Under daylight this stone reads bluish green. Under candlelight or tungsten it turns purplish red.
Ceylon alexandrite is typically larger and more transparent than Russian material, and a complete change at this saturation is rare in any origin.
Certified by Gübelin, Lucerne. Currently reserved — comparable stones can be sourced on request.
- Unheated
- Colour Change
- Gübelin Certified
- Investment Grade
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