The asteriated or “star” diamonds, weighing 8.14 carats and eight.57 carats, appeared throughout the lab’s summer season 2024 model of “Gems & Gemology.”
The stones displayed delicate brown cloud inclusions, which come from extreme concentrations of hydrogen and nickel all through their progress interval, said GIA, and might also comprise graphite.
GIA said asteriated diamonds are typically submitted to the lab, nevertheless these two stones are notable for his or her huge measurement and preserved pure varieties.
The 8.14-carat diamond was resorbed—partially dissolved by pure fluid or magma, inflicting it to sort out a rounded kind—and maintained most of its robust sort on one side.
The stone was sliced to level out the underlying inclusion pattern on the other side.
The preserved robust surfaces moreover displayed brown radiation stains, which can be an indication that it had pure alpha irradiation adopted by annealing throughout the earth.
The 8.57-carat diamond was polished with bruted edges.
Every diamonds’ clouds fluoresced inexperienced when subjected to long-wave UV, which GIA said is in step with beforehand studied asteriated diamonds.
Moreover, every stones confirmed extreme concentrations of hydrogen, which the lab detected using bulk Fourier-transform infrared spectroscopy.
Using photoluminescence mapping for the 8.14-carat stone, the lab observed that a variety of nickel-related defects have been detected contained within the cloud inclusion sector nevertheless not outdoor of it.
GIA moreover analyzed the diamonds using X-ray computed microtomography, which allowed the asteriated progress sectors to be seen in 3-D reconstructions.
It found the asteriated areas further strongly absorb X-rays than the rest of the diamond.
This implies, the lab said, the blended signal from the diamond and inclusions likely had the subsequent atomic amount.