Yes, under extreme heat and extreme pressure.
No
The Laboratory was created in 1844.
A natural diamond is one that is mined from the earth. One that is grown in a laboratory would not be a natural diamond.
Cavendish Laboratory was created in 1874.
Tokyo Laboratory was created in 1955.
Desert Laboratory was created in 1903.
Daresbury Laboratory was created in 1962.
Whittle Laboratory was created in 1973.
Schuster Laboratory was created in 1967.
Mesa Laboratory was created in 1966.
Laboratory Life was created in 1979.
Noyes Laboratory was created in 1902.