In a lab-grown diamond submitted for testing, Gemological Institute of America (GIA) scientists found a “never-before-seen” cloud feature resembling lines of text from an ancient manuscript.
“The dichotomy of a thoroughly modern diamond with a cloud feature that evoked an ancient text provided an interesting submission,” wrote the authors in the spring 2024 edition of Gems & Gemology, the GIA’s scientific journal.
The “lines” of clouds were a feature they had never seen before, added Sally Eaton-Magaña, senior manager of diamond identification at GIA in Carlsbad; Manisha Bhoir, manager of analytics at GIA in Mumbai; and Girish Dodiya, associate diamond grader at GIA in Surat.
The pear-shaped, 1.67-carat, D-color, SI1 chemical vapor deposition (CVD) diamond was submitted to the GIA’s Surat laboratory for testing.
Spectroscopy and fluorescence imaging confirmed it as a diamond grown by CVD that had undergone post-growth High Pressure-High Temperature (HPHT) annealing. Additionally, examination revealed the cloud feature, resembling lines of text, oriented at approximately 45 degrees to the growth interface seen with DiamondView imaging.
The diamond was noteworthy for its unusual and visually appealing clarity characteristic, concluded the authors.
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