Observations on CVD-Grown Synthetic Diamonds: A Review

Eaton-Magaña, Sally; Shigley, James E.; Breeding, Christopher M.

doi:10.5741/gems.52.3.222

Cited by 35 publications

(23 citation statements)

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“…Many gemological laboratories now offer low-cost melee testing services to help with identification. range observed for CVD synthetics, most of which were in the VVS 2 /VS 1 range, and slightly higher than the VS 2 /SI 1 range observed for colorless to near-colorless natural diamonds (Eaton-Magaña and Shigley, 2016). As GIA generally examines only the material that has been released by HPHT manufacturers as worthy of cutting, the samples likely represent what is available within the trade but might not account for the entire manufacturing output.…”

Section: Box B: Hpht Synthetic Diamond Meleementioning

confidence: 91%

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Saltwater Pearls from the Pre- to Early Columbian Era: A Gemological and Radiocarbon Dating Study

Zhou¹,

Hodgins²,

Lange³

et al. 2017

G&G

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Canadian subscribers should add GST. Discounts are available for group subscriptions, GIA alumni, and current GIA students. To purchase print subscriptions, visit store.gia.edu or contact Customer Service. For institutional rates, contact Customer Service. Database CoverageG&G is abstracted in Thomson Reuters products (Current Contents: Physical, Chemical & Earth Sciences and Science Citation Index-Expanded, including the Web of Knowledge) and other databases. For a complete list of sources abstracting G&G, go to gia.edu/gems-gemology, and click on "Publication Information." Manuscript SubmissionsGems & Gemology, a peer-reviewed journal, welcomes the submission of articles on all aspects of the field. Please see the Author Guidelines at gia.edu/gemsgemology or contact the Managing Editor. Letters on articles published in G&G are also welcome. Please note that Field Reports, Lab Notes, Gem News International, Micro-World, and Charts are not peerreviewed sections but do undergo technical and editorial review.

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Section: Box B: Hpht Synthetic Diamond Meleementioning

confidence: 91%

“…In contrast, CVD synthetics are often subjected to postgrowth treatment. Most near-colorless CVD synthetics are subsequently HPHT treated (to remove any brown coloration), while the pink samples (the other major CVD product) undergo irradiation and annealing (Eaton-Magaña and Shigley, 2016).…”

Section: Analysis Of Existing Datamentioning

confidence: 99%

Saltwater Pearls from the Pre- to Early Columbian Era: A Gemological and Radiocarbon Dating Study

Zhou¹,

Hodgins²,

Lange³

et al. 2017

G&G

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“…The white dotted area is the (100) growth sector, which features yellow-green fluorescence, and the yellow and red dotted areas represent the (110) and (113) growth sectors, respectively. The color emitted by diamonds under DiamondView TM depends on the type and amount of impurities contained in the diamond [25]. The HPHT seed substrate features green fluorescence due to a nitrogen-vacancy-nitrogen (H3) defect.…”

Section: Methodsmentioning

confidence: 99%

Comparison of the quality of single-crystal diamonds grown on two types of seed substrates by MPCVD

Yun

Guo

Lin

et al. 2018

Journal of Crystal Growth

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Microwave plasma chemical vapor deposition (MPCVD) was used to grow single-crystal diamonds on two types of single-crystal diamond seed substrates prepared by high-pressure, high-temperature (HPHT) and chemical vapor deposition (CVD) methods. The quality of diamonds grown on the different seed substrates was compared. Fluorescence characteristics showed that the sectors of the HPHT seed substrates were obviously partitioned. Raman and absorption spectra showed that the CVD seed substrate produced higher-quality crystals with fewer nitrogen impurities. X-ray topography showed that the HPHT seed substrate had obvious growth sector boundaries, inclusions, dislocations, and stacking faults. The polarization characteristics of HPHT seed substrate were obvious, and the stress distribution was not uniform. When etching HPHT and CVD seed substrates using the same parameters, the etching morphology and extent of different growth sectors of the two substrates differed. Although extended defects were inevitably formed at the interface and propagated in the CVD layer, the dislocation density of a 1 mm-thick CVD layer grown on a CVD seed substrate was only half that of a 1 mm-thick CVD layer grown on an HPHT seed substrate. Therefore, the use of CVD seed substrate enabled the growth of a relatively higher-quality CVD single-crystal diamond.

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“…PL mapping has also proven useful for synthetic diamonds grown by the chemical vapor deposition (CVD) method; it has been helpful not only for identifying CVD-grown diamonds [41], but also to perform more fundamental research on the growth process. For example, with a DiamondView microscope, we can often and easily see a growth interface that indicates a stop/start growth event in CVD-grown diamonds.…”

Section: Cvd-grown Diamondsmentioning

confidence: 99%

Raman and Photoluminescence Mapping of Gem Materials

et al. 2021

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Raman and photoluminescence (PL) mapping is a non-destructive method which allows gemologists and scientists to evaluate the spatial distributions of defects within a gem; it can also provide a method to quickly distinguish different species within a composite gem. This article provides a summary of this relatively new technology and its instrumentation. Additionally, we provide a compilation of new data for various applications on several gemstones. Spatial differences within diamonds can be explored using PL mapping, such as radiation stains observed on the rough surface of natural green diamonds. Raman mapping has proven useful in distinguishing between omphacite and jadeite within a composite of these two minerals, identifying various tourmaline species within a heterogeneous mixture, and determining the calcium carbonate polymorphs in pearls. Additionally, it has potential to be useful for country-of-origin determination in blue sapphires and micro-inclusion analysis. As new avenues of research are explored, more applications for gem materials will inevitably be discovered.

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Observations on CVD-Grown Synthetic Diamonds: A Review

Cited by 35 publications

References 0 publications

Saltwater Pearls from the Pre- to Early Columbian Era: A Gemological and Radiocarbon Dating Study

Saltwater Pearls from the Pre- to Early Columbian Era: A Gemological and Radiocarbon Dating Study

Comparison of the quality of single-crystal diamonds grown on two types of seed substrates by MPCVD

Raman and Photoluminescence Mapping of Gem Materials

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