The 6.01-carat, pear-shaped synthetic diamond was fraudulently inscribed with the Gemological Institute of America report amount for a G-color pure diamond of the similar dimension and kind, nevertheless with only a few key variations, IGI acknowledged in a info launch issued Tuesday.
First, the lab acknowledged, photoluminescence (PL) spectroscopy, which is now also used by grading labs to separate pure diamonds from lab-grown stones and to ascertain diamond treatments, reveals a wavelength peak of 737 nanometers throughout the diamond (see chart beneath).
That’s an indicator that the diamond was grown in a producing unit using the chemical vapor deposition course of.
The photoluminescence spectra for the 6.01-carat lab-grown diamond currently examined by the Worldwide Gemological Institute
Second, when examined beneath a microscope, IGI graders observed a carbon inclusion the place the feather was indicated on the readability plotting diagram throughout the GIA report.
Moreover they noticed a cloud inclusion, resulting in IGI giving the lab-grown diamond a lower readability grade than VVS1, the readability grade of the pure diamond.
Lastly, there was a discrepancy between the depth of the diamond IGI examined and the depth well-known on the GIA report.
“All people in our enterprise needs to be vigilant,” acknowledged IGI CEO Tehmasp Printer, who took over as head of the lab in October after Roland Lorie retired.
“As tried fraud will enhance, the need for ongoing verification is a important step to protect buyers from shopping for misrepresented gems and jewelry.”
The data from IGI comes on the heels of a story from Rapaport about Italian grading lab Gem-Tech discovering three lab-grown diamonds inscribed with GIA report numbers for pure diamonds.
Based mostly on the report, these diamonds had been accompanied by bodily grading research stating they’d been pure diamonds.
Nonetheless, similar to the 6.01-carat lab-grown diamond examined by IGI, the stones Gem-Tech examined displayed traits normally solely seen in diamonds grown using the CVD course of.
Moreover like IGI graders, the Gem-Tech graders noticed the three submitted stones had been barely utterly completely different than the diamonds described throughout the grading research.
GIA issued a info launch about fraudulent inscriptions once more in May 2021 following a string of incidents earlier that 12 months, along with the submission of three moissanites engraved with report numbers for pure diamonds and the submission of a combination of lab-grown diamonds and dealt with pure diamonds engraved with fraudulent report numbers.
In that launch, Tom Moses, GIA govt vp and chief laboratory and evaluation officer, acknowledged, “This unfortunate state of affairs demonstrates why it’s important, notably in any transaction the place the shopper does not have a trusted relationship with the seller, to have the diamond grading report updated sooner than ending a purchase order order.”
GIA acknowledged it has seen “plenty of” lab-grown diamonds with counterfeit inscriptions referencing GIA diamond grading research for pure diamonds.
These lab-grown diamonds have measurements and weights which will be just about an similar to the GIA research nevertheless the variations are “necessary ample to raise concerns.”