20.175ct Purple–Green Colour Change Corundum Alexandrite | Pixel Cut | 13x18 mm | Gemdrop® Verified

A spectacular 20.175 ct lab-grown colour-change corundum Alexandrite featuring a dramatic purple-to-green colour change under different lighting conditions.

This gem is corundum (Al₂O₃), the same mineral family as ruby and sapphire. It displays an alexandrite-like colour change, but it is not chrysoberyl alexandrite. Gemdrop® clearly identifies both the underlying mineral and its optical appearance for complete transparency.

Czochralski-Grown Corundum

This gem was created using the Czochralski crystal growth process, producing high-quality single-crystal corundum with excellent clarity and colour.

Its carefully controlled chemistry creates a distinctive colour-change effect:

• Cool/daylight: Green tones

• Warm/incandescent light: Purple tones

It is genuine laboratory-grown corundum, not glass or cubic zirconia, with the physical and chemical properties associated with synthetic sapphire.

Precision Pixel Cut

The striking Pixel Cut uses geometric faceting to create bold reflections, depth and a highly distinctive modern appearance.

At approximately 13x18 mm and 20.175 ct, this is a substantial statement gem ideal for bespoke jewellery, collector pieces and dramatic custom designs.

With a Mohs hardness of 9, corundum is highly durable and suitable for jewellery.

Gemdrop® Verified

Every Gemdrop® gem is scientifically verified and recorded in the Gemdrop Verification Database.

Verification records document key gemmological information including identity, dimensions, growth method, crystal system and physical properties.

Specifications

• Gem Type: Colour-Change Corundum Alexandrite

• Mineral: Corundum

• Chemical Formula: Al₂O₃

• Crystal System: Trigonal

• Origin: Lab-Grown

• Growth Method: Czochralski

• Colour: Purple–Green Colour Change

• Cut: Pixel Cut

• Dimensions: 13x18 mm

• Weight: 20.175 ct

• Hardness: 9 Mohs

• Verification: Gemdrop® Verified

Scientifically verified. Transparently documented. A remarkable statement gem created through science.