HPHT-Treated Diamonds

Dobrinets, Inga A.; Vins, Victor G.; Зайцев, А.М.

doi:10.1007/978-3-642-37490-6

Cited by 107 publications

(145 citation statements)

References 73 publications

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“…However, they are absent in the HPHTtreated diamonds and only one of the irradiation-treated diamonds shows very weak NV 0 center. In addition, one spectrum of the HPHT-treated diamonds displays an intense peak at 478.9 nm (not shown), which was suggested to be an indicator of possible HPHT treatment [26]. The 588 nm emission, considered as an evidence of multiprocess treatment [26], is observed in the multiprocess-treated diamonds.…”

Section: Microscopic Characteristicsmentioning

confidence: 94%

“…In addition, one spectrum of the HPHT-treated diamonds displays an intense peak at 478.9 nm (not shown), which was suggested to be an indicator of possible HPHT treatment [26]. The 588 nm emission, considered as an evidence of multiprocess treatment [26], is observed in the multiprocess-treated diamonds. These spectra also reveal peaks at 634.4 nm in the HPHTtreated diamonds, at 489.1, 558.1, 613.5, 647.1, and 657.9 nm in the irradiation-treated diamonds, and at 600.2 nm in the multiprocess-treated diamonds.…”

Section: Microscopic Characteristicsmentioning

confidence: 94%

“…Commonly, the H3 center has been observed in diamonds involving with irradiation and high temperature annealing (or HPHT annealing) [28][29][30] or been directly created in plastically deformed brown diamonds through heating at high temperature [31,32], while various concentrations of the H3 defect can also occur in some natural diamonds [33][34][35][36]. In nitrogen-containing diamonds, highenergy irradiation followed by annealing at temperatures over 500°C could result in the formation of H3 center [26]. Collins [37] reported that the H3 center had maximum intensity at approximately 800°C and annealed out at temperatures above 1500°C in irradiated diamonds.…”

Section: Spectroscopic Features and Related Treatmentmentioning

confidence: 99%

“…Weak line at 741 nm has been found in a few natural diamonds [41,42]. Through high-energy irradiation (electrons, gamma-rays, neutrons, and ions), the GR1 center could be artificially created in most of diamonds [22,26]. Kiflawi et al [43] reported that there was an initial reduction in the strength of the GR1 absorption at 390-410°C followed by sharp decrease beyond 700°C in the irradiated diamonds.…”

Section: Gr1mentioning

confidence: 99%

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Spectroscopic Characteristics of Treated-Color Natural Diamonds

Wang

Shi

Yuan³

et al. 2018

Journal of Spectroscopy

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With the increasing availability of treated-color diamonds on the market, their characterization is becoming more and more critical to the jewelry testers and customers. In this investigation, ten color diamonds treated by irradiation (4 pieces), HPHT (3 pieces), and multiprocess (3 pieces) were examined by spectroscopic methods. These diamonds are classified to be type Ia according to their FTIR characteristics. Using microscope and DiamondView, the internal features (such as distinctive color zoning and graphitized inclusions) and complex natural growth structures were observed, which show that the samples are more likely artificially colored natural diamonds. Through photoluminescence spectroscopy, a combination of optical centers was detected, including N-V 0 at 575 nm, N-V − at 637 nm, H3 at 503 nm, H2 at 986 nm, and GR1 at 741 and 744 nm. Combining with the previous studies, treatment conditions for the studied diamonds were estimated depending on the presence and/or absence of the optical centers. In addition, the coloration mechanism of the samples (blue, green, and red) during the treatment process was also discussed. It is suggested that a number of techniques should be combined in order to make a reliable identification for such diamonds.

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Section: Microscopic Characteristicsmentioning

confidence: 94%

Section: Microscopic Characteristicsmentioning

confidence: 94%

Section: Spectroscopic Features and Related Treatmentmentioning

confidence: 99%

Section: Gr1mentioning

confidence: 99%

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Spectroscopic Characteristics of Treated-Color Natural Diamonds

Wang

Shi

Yuan³

et al. 2018

Journal of Spectroscopy

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“…A természetes gyémánt kristályokban a nitrogén koncentrációja elérheti akár a 10 4 ppm-et is [22,1]. Előfordulhat egyetlen szubsztitúciós atomként, illetve kettő, vagy több atomból álló aggregált formában is.…”

Section: áBra: a Gyémántban Leggyakrabban Előforduló éS Nitrogénhez (unclassified

Lumineszcencia centrumok kialakítása és spektrális jellemzése nanogyémántban

Himics

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Fluorescence of Natural and Synthetic Gem Diamond: Mechanism and Applications

Breeding¹,

Eaton-Magaña²

2019

Encyclopedia of Analytical Chemistry

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Fluorescence is a property exhibited by all states of matter but rarely is it more impressive than the blue gleam emitted when a gem‐quality diamond is exposed to ultraviolet (UV) light. Diamond fluorescence and phosphorescence are a product of atomic impurities like nitrogen and boron that can occur in concentrations as low as several parts per billion, yet still impact the body color and luminescence characteristics. Distribution of fluorescence in gem diamond is different between natural and laboratory‐grown crystals and is often changed by treatments aimed at modifying diamond color, making it a valuable gemological identification tool. While diamond is most readily recognized as a gemstone, its value is even greater in the technology sector where single photon emitting defects in diamond are a key component in today's research on quantum computing and semiconductor applications.

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HPHT-Treated Diamonds

Cited by 107 publications

References 73 publications

Spectroscopic Characteristics of Treated-Color Natural Diamonds

Spectroscopic Characteristics of Treated-Color Natural Diamonds

Lumineszcencia centrumok kialakítása és spektrális jellemzése nanogyémántban

Fluorescence of Natural and Synthetic Gem Diamond: Mechanism and Applications

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