The Basics: What Makes a Metal a "PGM"?
Platinum group metals are a family of six chemically similar metallic elements that share remarkable physical and catalytic properties. They are grouped together on the periodic table in a cluster within the transition metals section. The six PGMs are:
- Platinum (Pt) — atomic number 78
- Palladium (Pd) — atomic number 46
- Rhodium (Rh) — atomic number 45
- Iridium (Ir) — atomic number 77
- Osmium (Os) — atomic number 76
- Ruthenium (Ru) — atomic number 44
Of these six, platinum, palladium, and rhodium are by far the most economically significant and most commonly discussed in investment and industry contexts.
What Makes PGMs Valuable?
PGMs are prized for a combination of properties that few other materials can match:
- Extreme rarity: All PGMs are among the rarest elements in Earth's crust. Annual global production of platinum, for example, is a fraction of annual gold production by weight.
- Exceptional catalytic ability: PGMs are extraordinarily effective at accelerating chemical reactions without being consumed in the process. This makes them irreplaceable in catalytic converters, industrial chemical processes, and fuel cells.
- Corrosion resistance: PGMs resist tarnishing, oxidation, and attack by most acids, making them durable in demanding environments.
- High melting points: Most PGMs remain solid and stable at temperatures that would destroy other materials.
Where Do PGMs Come From?
The vast majority of the world's PGM supply comes from two countries:
- South Africa — home to the Bushveld Igneous Complex, which contains the largest known PGM reserves on Earth. South Africa dominates platinum and rhodium production.
- Russia — the Norilsk region is the world's leading source of palladium, as well as significant quantities of platinum and other PGMs.
Smaller but meaningful quantities are also produced in Zimbabwe, Canada, and the United States (primarily Montana).
How Are PGMs Used?
The uses of PGMs span a remarkable range of industries:
Automotive
This is the largest single end-use market. Catalytic converters in petrol and diesel vehicles use platinum, palladium, and rhodium to convert toxic exhaust gases into less harmful substances. As emissions standards tighten globally, the amount of PGM required per vehicle has generally increased.
Jewellery
Platinum has been prized in fine jewellery for over a century, valued for its prestige, durability, and hypoallergenic properties. Palladium has also been used as a more affordable alternative in rings and settings.
Industrial Catalysts
Beyond vehicles, PGMs catalyse vital industrial chemical processes including the production of nitric acid, petroleum refining, and the manufacture of numerous chemicals and plastics.
Electronics
Palladium and ruthenium are critical components in multilayer ceramic capacitors (MLCCs) found in smartphones, computers, and other electronic devices. Iridium is used in specialist electrodes and spark plugs.
Hydrogen Economy
Platinum is a key material in hydrogen fuel cells — devices that generate electricity from hydrogen and oxygen. As interest in hydrogen as a clean energy carrier grows, platinum's potential role in this sector has attracted considerable attention.
How Are PGM Prices Quoted?
Like gold and silver, PGM spot prices are traditionally quoted in US dollars per troy ounce. A troy ounce is approximately 31.1 grams — slightly heavier than a standard (avoirdupois) ounce. Prices are set by trading activity on commodity exchanges, over-the-counter dealer markets, and the London Platinum and Palladium Market (LPPM) fixing process.
PGMs vs. Gold and Silver: What's Different?
| Feature | PGMs | Gold & Silver |
|---|---|---|
| Primary demand driver | Industrial / automotive | Investment / jewellery |
| Supply geography | Highly concentrated | More geographically diverse |
| Market size | Smaller, less liquid | Larger, more liquid |
| Safe-haven status | Limited | Strong (especially gold) |
Where to Go From Here
Now that you understand the foundations, you're ready to explore how PGM markets work, how prices are determined, and how investors access these metals. Start by reading up on individual metal profiles and the different investment vehicles available — the journey into PGMs is one of the most fascinating corners of the commodities world.