Gemstone's formation_rock cycle_Igneous_Metamorphic_ Sedimentary rocks

In other to form a crystal, there are five requirements: material, temperature, pressure, time and space. Minerals are formed under various condition in the earth. Most gemstones are formed in the earth's crust. It is the top layer of the earth and is 3 to 25 miles deep.
Rock cycle: Igneous rocks, Sedimentary rocks, Metamorphic rocks.
Igneous rocks---weathering---transportation---deposition---compaction & sedimentation
---sedimentary rocks---metamorphism---metamorphic rocks---melting---magma-crystallization---igneous rocks(intrusive)---uplift & eruption---igneous rocks(extrusive)

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