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Volume 16 Issue 5
Oct.  2014
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ZHU Hongwei, LI Ting, LI Guihua. Identification Characteristics of HPHT Synthetic Diamonds in Jewelry with Cluster Setting[J]. Journal of Gems & Gemmology, 2014, 16(5): 28-33.
Citation: ZHU Hongwei, LI Ting, LI Guihua. Identification Characteristics of HPHT Synthetic Diamonds in Jewelry with Cluster Setting[J]. Journal of Gems & Gemmology, 2014, 16(5): 28-33.
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Identification Characteristics of HPHT Synthetic Diamonds in Jewelry with Cluster Setting

  • National Gold&Diamond Testing Center, Ji'nan 250014, China

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  • Received Date: February 23, 2014
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    • Abstract
  • A lot of yellow HPHT synthetic diamonds were found in hundreds pieces of cluster set diamond jewelry, which were received by National Gold & Diamond Testing Center. The HPHT synthetic diamonds were tested systematically by using gem microscope, infrared spectrometer,X-ray fluorescence spectrometer, ultraviolet-visible spectrophotometer, ultraviolet fluorescent lamp and DiamondViewTM, The results show that the colour of HPHT synthetic diamonds is relatively consistent yellow with a large number of rod-like, columnar,fine particulate iron-nickel alloy inclusions. Almost all of these synthetic diamonds are magnetic, even strong magnetic. HPHT synthetic diamonds have an apparent infrared absorption peak at 1 131 cm-1. It indicates these diamonds belong to type Ib diamond which are not common in natural diamonds. Strong peaks of iron and nickel could be tested by X-ray fluorescence. HPHT synthetic diamonds almost exhibit yellow-green fluorescence under shortwave UV fluorescence HPHT synthetic diamonds display yellow-green fluorescence in varying degrees under the DiamondViewTM, and individual shows a black cross phenomenon.
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    • References (14)
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