Well, a gravel, it's something deep down in the ground that is mixed with stones like marbles and sand, black, and if one is fortunate you will find diamonds in there. That is after you have removed the upper layer of the soil, and then you dig deep down, you will meet some other surfaces that is mixed with sand and there is a material in there that is called koloudu, it is something like a stone. And anywhere they say they have, diamonds are possibly there. And sometimes you would take samples of such soils and the sample too looks like a diamond, but it is actually not a diamond, but it is not difficult to detect the difference between that sample and a diamond. So all of those materials, all of those things, they are normally mixed together in one place and that is what we refer to as gravel.