Rare earths are used as polishing agents, phosphors, and catalysts. These are used to polish optical-quality glass, control air pollution, and illuminate screens on electronic devices. The demand for each of these products is anticipated to increase. In their most crucial applications, other materials can replace rare earth metals; however, these alternatives are typically more expensive and less efficient.
Cerium oxide was a very well-liked lapidary polish from the 1950s to the early 2000s. It was very efficient and reasonably priced. The use of cerium oxide in rock tumbling and the lapidary arts has virtually disappeared as a result of recent price increases. These days, aluminium oxide and titanium oxide are used in its place as polishes.
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