As mentioned before, there are three types of rock:
Igneous: Rock formed as magma cools and crystalizes or when lava flows on top of the earth’s surface. Gemstones that come out of igneous rocks are:
Citrine
Amethyst
Garnets
Moonstone
Diamond
Tourmaline
Sedimentary: Rock formed when another rock is worn down and the fragments are carried through water or wind and get compressed together to form stones. Gemstones that come out of sedimentary rocks are:
Jasper
Malachite
Opal
Zircon
Metamorphic: Rock formed when intense pressure or heat from the underground is applied to already existing rocks. Gemstones that come out of Metamorphic rocks are: