Most gems form naturally as minerals within the earth. The minerals are forced together and they metamorphose into different minerals sometimes without melting. Most gemstones form in the earth s crust. Most form as crystals solids whose atoms are arranged in highly ordered repeating patterns called crystal systems. Gemstones created by environment changes when magma forces itself through existing rock in the earth s crust as in a volcano the heat can re melt the already formed rock and create new crystals that are more heat resistant than before.
How gemstones are formed minerals form under various conditions in the earth. Learning about mineral crystallization and the geological processes involved in gem formation will help gemologists understand some of the properties they ll encounter in gemstones. Only two gemstone varieties diamond and peridot form in the earth s mantle which represents 80 of the earth s volume. The majority of gemstones are formed by metamorphism. How gemstones are formed minerals form under various conditions in the earth.
The majority of gemstones are formed by metamorphism. Most gems form naturally as minerals within the earth.
