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http://ikonet.com/en/visualdictionary/static/us/minerals_precious_stones
Over time, the structure of some minerals changes under high pressure or high temperatures, producing new kinds of minerals in the process. More than 3,500 different minerals have been discovered so far. Most of them combine to form rocks, like the quartz, feldspar, and mica found in granite. The rarest and most beautiful may be turned into jewelry.
http://www.naturaljewels.com/rock_used.htm
Malachite (right) is a rich green mineral found in the oxidation zone of copper deposits (hydrous copper carbonate). The malachite used in lapidary work usually forms in a mass similar to a stalactite with concentric color banding. Its beauty is valued not only for jewelry, but as a carving …
https://brightwatercove.com/types-of-semi-precious-gemstones-used-in-jewelry/
A semi-precious stone or also known as a gem or gemstone is a portion of mineral, which, in refined and cut form, is used to create jewelry. Aside from minerals, there are also organic resources or precise rocks that are also used for jewelry and can be considered as gemstones as well.
https://www.thesprucecrafts.com/stones-in-vintage-costume-jewelry-4026020
These are most often cabochons (see above) in round or oval shapes which are unfoiled and transparent, but some faceted examples were used in mid-century costume jewelry. They were first used in jewelry in the early 1900s to simulate fire/jelly opals. These stones are very often set in sterling silver, and some are of Mexican origin.
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