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http://dx.doi.org/10.6111/JKCGCT.2020.30.1.021

Spectroscopic analysis of near colorless/pink/blue synthetic diamonds from Lightbox  

Choi, Hyunmin (Hanmi Gemological Institute & Laboratory (HGI, GIG))
Kim, Youngchool (Hanmi Gemological Institute & Laboratory (HGI, GIG))
Lee, Minkyoung (Department of Gem&Jewelry Craft, Korea National University of Welfare)
Seok, Jeongwon (Department of Advanced Materials & Energy Engineering, Dongshin University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.30, no.1, 2020 , pp. 21-26 More about this Journal
Abstract
This article reports the result on the spectroscopic analysis of the three Lightbox CVD-grown diamonds. Lightbox Jewelry, a De Beers company, has begun selling CVD laboratory-grown diamonds since September 2018. Recently, we had the opportunity to examine three Lightbox's pendant necklaces. The 0.25 ct, 0.25 ct, and 0.26 ct round brilliant were graded as "H" near colorless, Fancy Vivid orangy pink, and Fancy Vivid blue with cut grades of excellent, respectively. The laser-inscribed Lightbox logo under the table, large enough to be easily visible with a microscope. Based on the spectroscopic techniques, for near colorless sample was not subjected to post-growth HPHT processing to improve its color. For pink sample, optical centers at H3, 3H, 594 nm, NV, and GR1 were recorded. It was speculated that the pink sample have been received irradiation and annealing. In addition, the blue CVD synthetic sample was concluded to be irradiated without annealing.
Keywords
CVD laboratory-grown; Lightbox synthetic diamond; Spectroscopic analysis;
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Times Cited By KSCI : 2  (Citation Analysis)
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