People change the world; objects, unless they are destructive, aren't known for changing the world.
No.
once you have 10 diamonds you can swap them for a pass.
No.
Diamonds are formed in a crystalline structure from carbon. Not all crystals are formed from carbon; not all crystals are diamonds.
There are several companies that create synthetic diamonds or cultured diamonds. One such company that creates the best synthetic diamonds is New World Diamonds.
India was the only source of diamonds in the world until that time according to the Gemological Institute of America.
Two
You can purchase diamonds in most any city in the world. There is no 'city' where diamonds are mined, however.
Sometimes. Diamonds can come in a variety of different colour. Pink diamonds are actually among the world's rarest and most expensive diamonds.
Diamonds are found below level 16 of the world.
Your answer probably depends on your world.
You can find diamonds on every continent except Europe and Antarctica.