1984
DOI: 10.5741/gems.20.3.146
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Identifying Gem-Quality Synthetic Diamonds: An Update

Abstract: The existence of gem-quality synthetic diamonds and their potential impact on the marketplace has long been a source of concern to gemologists and gem dealers the world over. While w e do not know whether cuttablegem-quality diamonds have been synthesized in other nations, we do know that the General Electric Company has successfully synthesized cuttable gemquality diamonds i n the United States. Eight of these diamonds were studied i n an attempt to determine means of identifying them using standard gemologic… Show more

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Cited by 25 publications
(34 citation statements)
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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%
“…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%
“…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%
“…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%