Gemstones form under conditions of high pressure and temperatures as minerals within the rocks, or form as independent minerals and crystals as products of hydro-thermal processes at relatively low temperatures. As they form as rock derivative or accessory mineral, the occurrence of a gemstone depends on the rock structure, i.e. the chemical composition of a rock defines which gemstones can potentially be formed. Minerals and gemstones in rocks are formed in the process when magma or molten rock begins to cool, when some elements separate from the main mass and form crystals or separate entities. Insidermonkey experts made a list of 7 easiest gemstones to find in rocks and creeks.
Rocks that most commonly bear gemstones are legitimates, in which also some of the largest gemstones are found. Apart from them, many other silica-rich igneous rocks also contain gemstones of silicate origin, and most gemstones actually are silicates. Do not forget that some organic materials such as pearls are also considered to be gemstones, but those are not found in rocks and creeks (except for petrified wood for example). So having all this in mind, one must have the insight in the basic geological setting of a certain region in order to know where gemstones can possibly occur. You can also check our list of the Most Expensive Gemstones in the World.
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