Identifying Gem-Quality Synthetic Diamonds: An Update

Koivula, John I.; Fryer, C. W.

doi:10.5741/gems.20.3.146

Cited by 25 publications

(34 citation statements)

References 1 publication

(1 reference statement)

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“…For decades, gemologists have known that synthetic diamonds grown under high-temperature, high-pressure (HPHT) conditions often contain ironrich flux particles that are sufficiently large and abundant to cause visible attraction to a magnet (Webster, 1970, p. 332;Koivula, 1984, figure 1). Since natural…”

Section: Acknowledgmentsmentioning

confidence: 99%

Natural Pearls from Australian <i>Pinctada Maxima</i>

Scarratt¹,

Bracher²,

Bracher³

et al. 2012

Gems & Gemology

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Section: Acknowledgmentsmentioning

confidence: 99%

Natural Pearls from Australian <i>Pinctada Maxima</i>

Scarratt¹,

Bracher²,

Bracher³

et al. 2012

Gems & Gemology

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“…Although the differences have been researched and documented fully by leading gemologists, the threat has been conveyed to the gem community. (Koivula and Fryer, 1984;Shigley et al, 1986;Shigley et al, 1987;Nassau, 1990). Lenzen (1983) and more recently, Nassau (1993) have proposed a different stance.…”

Section: Theimportancetothe Natural Diamond Industrymentioning

confidence: 99%

Synthetic diamond developments: perspectives from technology analysis

Japp

1994

R & D Management

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Synthetic diamond technology appears t o have the capability of significantly changing the future technological landscape. Accordingly, The Institute for the Management of Technology regards it as a 'marker' technology. This paper suggests that there is a need t o review expectations concerning synthetic diamond developments. Technology analysis is used as a method t o understand and communicate the expectations. The history trends and applications are presented. T w o challenges are revealed: First, High Pressure and High Temperature is being challenged by Chemical Vapour Deposition as the dominant manufacturing technology, suggesting that the latter should be monitored for breakthroughs. Second, the distinction between synthetic and natural gems is becoming harder t o determine. This threat t o the gem industry, in combination with the expanding industrial use, suggests that efforts should be pursued t o establish the uniqueness of natural gems and t o prevent the name 'diamond' from being ubiquitously used.

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“…In the ferromagnetism analysis, to detect the possible ferromagnetic residue from the solvent in a synthesized diamond during HPHT synthesis, the B-H hysteresis loops were measured with a resolution of 10 −4 emu/cc by applying an external magnetic field up to 3000 Oe with a vibrating sample magnetometer (VSM) [8,9].…”

Section: Methodsmentioning

confidence: 99%

Characterization of synthesized and treated gem diamonds

Song

2007

Met. Mater. Int.

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Synthesized diamonds have been widely employed as polishing media for precise machining and noble substrates for microelectronics. The recent development of the split sphere press has led to the commercial HPHT (high pressure high temperature) synthesis of bulk gem diamonds from graphite and to the enhancement of low quality natural diamonds. Synthesized and treated diamonds are sometimes traded deceptively as high quality natural diamonds because it is hard to distinguish among these diamonds with conventional gemological characterization methods. Therefore, we need to develop a new identification method that is non-destructive, fast, and inexpensive. We proposed using new methods of UV fluorescence and X-ray Lang topography for checking the local HPHT stress field as well as using a vibrating sample magnetometer for checking ferromagnetic residue in synthesized diamonds to distinguish these diamonds from natural ones. We observe unique differences in the local stress field images in synthesized and treated diamonds using Lang topography and UV fluorescence characterization. Our result implies that our proposed methods may be appropriate for identification of the synthesized and treated diamonds.

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Identifying Gem-Quality Synthetic Diamonds: An Update

Cited by 25 publications

References 1 publication

Natural Pearls from Australian <i>Pinctada Maxima</i>

Natural Pearls from Australian <i>Pinctada Maxima</i>

Synthetic diamond developments: perspectives from technology analysis

Characterization of synthesized and treated gem diamonds

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