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Volume 6 Issue 4
Dec.  2004
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MAI Xiao, CHEN Mei-hua, CHEN Zheng. HPHT Treatment Technology of Diamond[J]. Journal of Gems & Gemmology, 2004, 6(4): 22-24,31.
Citation: MAI Xiao, CHEN Mei-hua, CHEN Zheng. HPHT Treatment Technology of Diamond[J]. Journal of Gems & Gemmology, 2004, 6(4): 22-24,31.
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HPHT Treatment Technology of Diamond

  • 1. Gemmological Institute, China University of Geosciences, Wuhan 430074, China;

  • 2. Shanghai Jianqiao Professional Technique College, Shanghai 201319, China

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  • Received Date: July 21, 2004
  • Available Online: July 21, 2024
    Graphical Abstract
    • Abstract
  • High pressure and high temperature (HPHT) intensify the plastic deformation of natural Ⅰa brown diamonds and make the dislocation in the crystal multiply and slippage, thus the brown transforms into the yellow-green. HPHT provide the lattice defects in Ⅱa brown diamonds with sufficient potential energy for movement, recombination and annihilation, and restore them to the stable state and original colourlessness. HPHT-processing of the natural gray diamonds containing graphite and a new model of the colour enhancement are proposed. It is proposed that there occurs a polymorphous transformation from graphite inclusions to diamonds during HPHT-processing. As a result, microscopic graphite inclusions disappear completely, thus removing the gray component and making diamond crystals more transparent (colourless).
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    • References (12)
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