A rare rock of the size of a golf ball ensconced with 30,000 tiny octahedral diamonds sized between 10 to 700 microns with speckles of green and red garnet was discovered in Udachnaya diamond mine, in Northern Siberia. A professor from the University of Tennessee in the US is studying this rare rock by beaming electrons to trace the gem’s origins and the make of the chemicals trapped inside.
The two and three dimensional images revealed abnormal carbon isotopes for this type of rock, indicating it was originally formed as part of the crust of the Earth, reacted by tectonic shifts and transformed into the shimmery rock.
Scientists believe that these diamonds emerge from over 100 miles deep in the Earth’s mantle and are carried to the surface by special volcanic eruptions.
This rock is one of only a few hundred recovered in which the diamonds are still in their original setting from within the Earth, 
Taylor said.
The findings were presented at the American Geophysical Union’s annual conference in San Francisco in December and will be a part of the forthcoming special issue of Russian Geology and Geophysics this month.