They are made using high pressure high temperature and chemical vapor deposition. They were first created by the Soviet Union to detonate explosives.
They are usually used in abrasives and polishing tools. 98% of diamonds used industrialy are synthetic.
Today synthetic diamonds effect the world positively.
They can be used cheaply for jewelry. They can be used cheaply for industrial uses.
They have helped science come a long way.
Citations:
Words: http://en.m.wikipedia.org/wiki/Synthetic_diamond