1987
DOI: 10.5741/gems.23.4.187
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The Gemological Properties of the De Beers Gem-Quality Synthetic Diamonds

Abstract: Gem-quality synthetic diamond crystals weighing up to 11 ct have been grown in limited numbers at the De Beers Diamond Research Laboratory since the 1970s. These crystals have been produced strictly on an experimental basis and are not commercially available. Examination of a group of 14 brown1s17 yellow, yellow, and greenish yellow synthetic diamonds reveals distinctive gemological properties: uneven color distribution, geometric graining patterns, metallic inclusions, and, i n most cases, fluorescence t o sh… Show more

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Cited by 43 publications
(52 citation statements)
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“…These luminescence patterns are related to the relative sizes, differences in impurity content, and different geometric arrangements of the internal growth sectors. We were surprised, however, to see stronger luminescence from the octahedral growth sectors of these crystals than from their cube sectors (in contrast to previous observations; see Shigley et al, 1987). Regardless, this zoning geometry clearly indicates the presence of different types of growth sectors, which identifies the crystals as synthetic.…”
Section: Resultscontrasting
confidence: 52%
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“…These luminescence patterns are related to the relative sizes, differences in impurity content, and different geometric arrangements of the internal growth sectors. We were surprised, however, to see stronger luminescence from the octahedral growth sectors of these crystals than from their cube sectors (in contrast to previous observations; see Shigley et al, 1987). Regardless, this zoning geometry clearly indicates the presence of different types of growth sectors, which identifies the crystals as synthetic.…”
Section: Resultscontrasting
confidence: 52%
“…These two crystals are similar in morphology to the yellow synthetic diamonds described previously (Shigley et al, 1986(Shigley et al, , 1987.…”
Section: Resultssupporting
confidence: 51%
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“…It is known (Shigley et al 1987) that natural diamonds grow by layers in parallel with the octahedral faces, whereas synthetic diamonds of the metal-carbon syntheses generally grow by layers parallel with both octahedral {111} and cubic {100} faces, forming corresponding growth pyramids. This accounts for the optical and physical inhomogeneity of the MC diamonds in connection with the capture of metallic inclusions into the space between the growth pyramids and an irregular distribution of isomorphic impurities (e.g., nitrogen, nickel) and vacancies within the different growth sectors.…”
Section: Discussionmentioning
confidence: 99%