Rhodium is a tiny-volume, very high-value platinum-group metal whose commercial reality is set by two facts: it is almost always a byproduct, and most of it comes from South African platinum mining. In 2024, world primary rhodium supply was about 717 koz, or roughly 22 tonnes, with more than four-fifths attributed to South Africa and only small contributions from Russia, Zimbabwe, and North America. That makes rhodium structurally supply-inelastic: operators do not mine for Rh directly, so output responds mainly to platinum-group mine plans, smelter performance, and scrap recovery rather than rhodium's own price.

Demand is even more concentrated than supply. Implats' 2024 market table puts about 85% of rhodium demand in autocatalysts, where the metal's NOx-reduction performance is difficult to replicate at comparable loading. The remaining demand is mostly industrial hardware for glass, nitric acid, and specialty chemical service. That concentration explains rhodium's price history: when the auto market is tight and fabricators scramble for metal, prices can become extreme; when automobile demand softens or Chinese industrial buyers destock, the price can collapse quickly.

The 2020-2024 price series from USGS shows that reset clearly, from more than $20,000 per troy ounce in 2021 to about $4,600 in 2024. Even after that decline, rhodium remains strategically important because there are few producing regions, little direct mine flexibility, and limited substitutes in its core emissions-control role. For policy purposes it remains on the U.S. critical minerals list and within the EU's critical raw materials basket for PGMs.