Diamond oceans on Uranus and Neptune?

Old-school bOING bOING pal Jim Leftwich says:
A recent article in Nature Physics suggests there may be solid diamond icebergs floating in liquid diamond oceans on Uranus and Neptune. The article didn't mention whether there was also a diamond Titantic, along with diamond girl passenger wearing a diamond diamond.
"Diamond Oceans Possible on Uranus, Neptune"