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Color enhancement of Australian natural sapphire by the hydrothermal method

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2006, 16(6), pp.240-243
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Kim Hee-Seung 1

1동신대학교

Accredited

ABSTRACT

The significant color enhancement in low quality Australian natural sapphire has been achieved by a hydrothermalmethod. The optimal conditions for the color enhancement of Australian natural saphire were as follows; hydrothermalreaction temperature: 320~350oC, duration : 3 days, hydrothermal solvent: 2 M NaOH solution. After the hydrothermaltreatment, Australian natural saphires of transparent colors were obtained, and their grades were found to be improvedfrom comercial to midle/top grade by value chart analysis.

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