Been diving into precious metals lately and realized most people sleep on platinum. Everyone talks about gold and silver, but platinum actually sits as the third most-traded precious metal globally, and the reasons why are pretty interesting if you care about supply-demand dynamics.

So what is platinum used for anyway? The answer is way broader than most investors realize. The metal shows up everywhere - from your car's exhaust system to high-end jewelry to medical devices. Understanding these uses is actually key to predicting where platinum prices might head.

Let's start with autocatalysts. This is the biggest demand driver. Basically, catalytic converters in vehicles use platinum-group metals to convert over 90% of harmful exhaust like hydrocarbons and carbon monoxide into harmless stuff like CO2 and water vapor. This tech became standard in the US and Japan back in 1974, and now over 95% of new cars have them. The WPIC was forecasting around 3.17 million ounces of platinum demand from the automotive sector in 2024, expected to climb to 3.25 million ounces by 2025. That's serious volume.

Then there's jewelry, which is the second largest platinum demand source. The metal has qualities that make it perfect for this - it's strong, doesn't tarnish, and you can heat and cool it repeatedly without it hardening or oxidizing. Indigenous peoples in South America were already making platinum jewelry over 2,000 years ago. China is currently the biggest market for platinum jewelry, and demand was tracking to increase around 5% year-over-year.

But here's where it gets interesting - industrial applications for platinum are massive and often overlooked. Platinum catalysts help manufacture fertilizers, it's in silicones and hard drives, dental restoration, glass manufacturing, and sensors. Because platinum reacts to oxygen and nitrogen oxides, it's used to detect air quality changes in vehicles and buildings. The forecasts had industrial and medical demand combined hitting around 2.43 million ounces.

Medical uses are growing too. Platinum shows up in catheters, stents, and neuromodulation devices because it's durable, conductive, and biocompatible. Plus, it's inert in the body so it's safe for implants. And if you follow oncology at all, you know cisplatin and carboplatin - platinum-based drugs widely used for testicular, ovarian, breast, and lung cancer treatment.

Now here's the tension in the market. Platinum is 30 times rarer than gold and harder to mine, but the gold price has been more than double platinum's price since around 2015. Throughout 2024, platinum was trading between $900-$1,100 per ounce. The supply side is tight due to COVID hangover effects, Russia-Ukraine impacts, and ongoing issues in South Africa (the top producer). But demand has been lagging because of economic pressures, especially in automotive.

So what is platinum used for from an investment angle? Understanding these applications - autocatalysts, jewelry, industrial, medical - helps you see why platinum demand is structural but cyclical. When auto demand drops in recessions, platinum gets hit. But the long-term trend as pollution regulations tighten suggests autocatalyst demand won't disappear. If you're thinking about precious metals allocation, knowing what drives platinum demand versus gold or silver definitely matters for your strategy.