Nothing... diamonds are just one base: carbon.
Another Answer
There are diamonds that contain trace elements that can render colour in the stone. Most diamonds contain at least trace amounts of nitrogen, which gives diamonds a yellow cast: fancy yellow diamonds contain more nitrogen. Boron gives diamonds a blue, or blue-gray cast. And so on.
Trace elements that give diamonds colour are not separable from the diamond lattice.
Diamonds are not found in a great many different places. Diamonds are not found floating in the ocean for example.
Diamonds are commonly found in volcanic pipes.
No, no natural diamonds are found in New Zealand.
Diamonds are found below level 16 of the world.
The diamonds themselves are, well, diamonds. They're found mixed in with other rock, though.
Coal and diamonds are both forms of carbon.
Diamonds are found on every continent except Antarctica and Europe - so yes, diamonds are found in India.
Diamonds are continuously being found around the world, so there is no specific "last time" that they were found. The mining of diamonds happens on an ongoing basis in various countries where they are naturally occurring.
Diamonds are found on every continent on earth except Europe and Antarctica.
The Cullinan and Excelsior Diamonds were found in South Africa.
Real diamonds can be found in Arkansas.
All diamonds are found in the earth.