Gemstones are derived from the Earth and are formed inside Earth’s crust. It requires a no. of factors such as appropriate temperature, pressure and minerals in the molten form. The magma flows under all lands covered by the continents and the oceans. This liquid form of minerals soaks into the cracks and cools down to become different kinds of gemstones. The deposits of gems are found on all continents but a few of them are considered to be the major and important producers of gems.