Cerium (Ce): Uses, Supply and Investment Guide
Cerium is the most abundant rare earth element in the Earth's crust and in most rare earth ores. Cerium is used for glass polishing, vehicle catalytic converters and refining catalysts, but it is produced far beyond demand, so it carries a low price.
| Symbol | Ce |
|---|---|
| Atomic number | 58 |
| Group | Light rare earth (LREE) |
| Magnet rare earth | No |
| Main uses | Glass polishing; Catalytic converters; Refining catalysts and glass additives; Metallurgy |
| Main sources | Bastnaesite and monazite ores, co-produced with other light rare earths |
| China export status | No element-specific export licence |
| Price data | No public benchmark |
Cerium Price
Cerium oxide is among the cheapest rare earth products because supply far exceeds demand.
For the rare earths that do have public price series, see the rare earth price charts, and how rare earth pricing works for why most rare earths have no transparent benchmark.
What Is Cerium Used For?
- Glass polishing. Cerium oxide powder polishes optical glass, screens and silicon wafers to a very smooth finish.
- Catalytic converters. Cerium oxide stores and releases oxygen in vehicle exhaust catalysts, helping them convert pollutants.
- Refining catalysts and glass additives. Cerium is used in oil refining catalysts and to decolourise glass and block ultraviolet light.
- Metallurgy. Cerium-rich mischmetal improves steels and alloys and is used in lighter flints.
Where Does Cerium Come From?
Cerium makes up the largest share of most light rare earth ores, so production rises automatically whenever mines expand to meet neodymium and praseodymium demand. The result is a structural cerium surplus, and some producers stockpile it rather than sell at a loss.
China export controls on cerium
China does not require an element-specific export licence for this element. It has banned the export of rare earth extraction, separation and magnet-making technology since December 2023, which limits how quickly other countries can build supply.
How to Invest in Cerium
Cerium matters to rare earth investors as a cost rather than an opportunity. Ore bodies with a high cerium share earn less per tonne processed, so investors should check the share of neodymium and praseodymium in a project's ore.
For broader rare earth exposure, see the rare earth stock watchlist or the rare earth ETF comparison.
Cerium Investment Risks
- Persistent oversupply limits any price upside.
- Catalytic converter demand will fall as combustion engines give way to electric vehicles.
- Storage and disposal of surplus cerium adds cost for producers.
Cerium FAQ
What is cerium used for?
Cerium is used mainly for polishing glass, in catalytic converters and in oil refining catalysts. It also decolourises glass and strengthens some alloys.
Is cerium rare?
No, cerium is not rare. Cerium is the most abundant rare earth element and is about as common in the Earth's crust as copper.
Why is cerium cheap?
Cerium is cheap because rare earth mines produce more of it than the market uses. Mines are sized for neodymium and praseodymium, and cerium comes out as a surplus by-product.
Other Light rare earth (LREE) Elements
This page is research, not investment advice. See the disclaimer.