Large amount of pink and blue CVD- grown synthetic diamonds on the market
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2015-01-01 |
| Authors | Mikko Ć strƶm, Alberto Scarani |
| Citations | 1 |
Abstract
Section titled āAbstractāAn US-based diamond dealer presented to the authors large parcels (several hundreds of carats) of relatively uniformly colored fancy to fancy deep brownish pink and blue CVD-grown diamonds at AGTA Tucson 2015 show. Initial tests conducted on random samples indicated that both color variations were Type IIa; no nitrogen (or boron for blue stones) was detected in GemmoFTIR analysis. Photoluminescence (PL) studies with GemmoRaman-532SG (532 nm excitation) at room temperature confirmed the color origin of both variations was related to irradiation. Pink diamonds exhibited very strong nitrogenvacancy centers (NV at 575 nm & NV at 638 nm) and the spectra of blue stones were dominated by a strong PL-peak of general radiation defect (GR1) at 741 nm. These preliminary results turned to be an alert to conduct more tests in order to confirm the origin of the stones. It is a very rare situation to encounter a blue irradiated natural type IIa diamond, as most of these stones are colorless or can be HPHT -treated to colorless or pink by removing the brown component. Artificial irradiation producing blue color could be only expected for some rare type IIa stones which have not responded favorably to the HPHT-treatment.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal Sourceā- DOI: None