Precious metal and Rare earth

Precious metal noun - Any of the less common and valuable metals often used to make coins or jewelry.

Rare earth and precious metal are semantically related in group of chemical elements topic. In some cases you can use "Rare earth" instead a noun phrase "Precious metal".

Rare earth noun - Any element of the lanthanide series (atomic numbers 57 through 71).

Precious metal and rare earth are semantically related in group of chemical elements topic. You can use "Precious metal" instead a noun phrase "Rare earth".