Many of the most famous gemstones in the world, funded in parts of India and the Golconda diamond gravels of Myanmar and Sri Lanka.
Gem-rich gravel, because most of the gems are becoming increasingly resistant to chemical processes, akoya pearl necklace, such as rocks, where they form the weather. Gem grains accumulate either in the surface layer of rocks weather, or washed up and down the river gravels deposited some distance form indicating their source. Since precious stones are usually heavier, many common minerals, build levels, where the current can flow in both speed and volume decreases. imperfect fragments, probably destroyed when the minerals are transported over long distances and in conditions of turbulence, so that some fragments contain a high proportion of high-quality materials.
The uneven distribution of matter in each deposit jewelry makes the prediction of potential yield is almost impossible. As small deposits or in remote and inaccessible, is a major artificial lift is rarely cost effective. unconsolidated gravels have been developed to dig light of all the precious stones and gravel deposits hands for centuries. In Cambodia, pearl beads, Pailin washed gravel and a filter on one table and shook sapphires picked at leftovers.
Mining in the area of Australian sapphire systematic and mechanized. Holes will be drilled first to determine the volume and productivity gravel. After the removal of large earthmoving equipment, gravel, crushed and sorted by size fraction in the drum (drum). Smaller sapphires containing material in addictive patterns that concentrate heavy minerals past. This concentrate is finally sorted and sorted manually.
The study showed the world’s deposits of precious stones in almost all countries. Some areas are rich in diversity and quantity of precious stones on mineral products, including Brazil and Myanmar. Other types of settlements to Gem quality, for example, in respect of Colombian emeralds. Most fields are small and quickly exhausted, but some how they are in Myanmar, Sri Lanka and Afghanistan in production for centuries.