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Soâ¦how do beryl and chromium and vanadium get together to form emerald? How emeralds are formed. Plate tectonics shifts rock formations all over the place. Well, thatâs too much of an oversimplification, but it is the reason why ocean crust sometimes ends up scrunched together with continental rock. Part of the detailed explanation of plate tectonics.
Gems Formed in the Earthâs Mantle. 1  Magma pocket comes in contact with a weak area in crust. 2  A quick explosion results, carrying diamond-bearing magma to the surface. During the eruption, a cone builds on surface. 3  The pipe eventually cools, leaving carrot shaped pipe.