World important Jewels

Gem gravels are among the most productive sources of fine jewelry. Many of the most famous gemstones in the world are in the diamond fields of Golconda in India or the gravel from Myanmar and SriLanka working.
Gem-rich forms of gravel, because most rocks are more resistant minerals are formed from chemical processes in the time of the rocks. Gem grain or enriched in the surface layer of base rock time or implemented downstream and deposited into the path of the river gravel, some form of distance from the source. Gems are generally heavier than many common minerals concentrations accumulate in the lower river flow velocity and volume. Defective parts are most easily destroyed when the minerals are transported over long distances and under conditions of turbulence, so that some fragments contain a high proportion of good quality materials.

The unequal distribution of seats on every deposit made a prediction of potential yield almost impossible. How many small deposits and remote and difficult to large mechanized mining is rarely economical. consolidated gravels are the easiest to gravel on all deposits of precious and precious stones were dug by hand labor for centuries. Pailin in Cambodia gravel washed and sorted in a simple table shaking and sapphires are selected from smaller debris.
Mining in the areas of the Australian Sapphire is a more systematic and mechanized. The wells will be drilled first to establish the scope and effectiveness of the gravel. After the removal of large earthmoving equipment, gravel, crushed stone and is divided into size fractions in a drum (drum). Small devices that contain the momentum of sapphire rose to models, the heavy mineral concentrates are. This concentrate is finally sorted by hand.