They're valuable in part because the palladium inside is expensive. And Russia provides much of the world's palladium.
Although prices for aluminum and zinc are ticking up, Adam Schaller, vice president of a Michigan metal foundry, says business is growing.
The 10-year high in prices is due to unrest in Guinea, where a key component is mined, and the surge in demand for the green economy.
Copper has long been seen as an economic predictor. So why are prices dipping, and what are the implications?
Copper, especially, is a key ingredient in electric cars, wind turbines and batteries. Suppliers are not ready to meet the demand.
Millions of dollars worth of valuable metals end up being flushed down the drain, some coming from our own bodies.
Industrial giant Alcoa splits in two to grow high-tech aerospace and auto business.