Yes, under extreme heat and extreme pressure.
a diamond that is created in a laboratory environment using advanced technology to mimic the natural diamond-growing process
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.
There is a company called diamond Nexus who sell pure carbon man made diamonds. They can even make a Laboratory diamond to your preference, from the colour, cut and size.
Whittle Laboratory was created in 1973.
Cavendish Laboratory was created in 1874.
Flint Laboratory was created in 1912.
Tokyo Laboratory was created in 1955.
Ames Laboratory was created in 1947.
Carlsberg Laboratory was created in 1875.
Daresbury Laboratory was created in 1962.