Specifically, this rare «hexagonal diamond» — so named for its crystal structure — forms at a pressure of 500,000 atmospheres and on the timescale of billionths of a second. (scientificamerican.com)
They then zapped the electrons in the well with pulses of laser light, each 100 million billionths of a second long and covering a spot 16/100 of an inch across. (discovermagazine.com)