What is the difference between platinum and white gold rings?

Platinum is heavier. It’s denser, more expensive, and it develops a patina that some clients love and others can't wait to polish off. For a ring that's going to get knocked on a granite countertop every day of the week, I'll push most clients toward 18k white gold. I'll set platinum when someone insists, but I'll tell them exactly what they're signing up for.

The metal itself differs. Platinum rings are typically 950 parts pure platinum, alloyed with ruthenium or iridium - ruthenium is harder for prongs, iridium a touch softer but both are common. White gold is 75% gold, with the remaining 25% a mix of nickel, palladium, and sometimes a little zinc. Palladium-white 18k has a faint gray cast that I actually prefer; nickel-white is brighter but can provoke a reaction in a small percentage of people. If you’ve ever had cheap earrings make your lobes itch, mention it before I order alloy.

Out of the box, they look nearly identical because almost all white gold is rhodium plated. That plating is a brilliant, chrome-like white that wears off. On a daily-wear ring, you'll see it start to fade at the back of the band and around the prongs in about twelve to eighteen months. A re-plate costs around $80 and takes a few days. Platinum isn't plated. It's a natural gray-white that scratches and dulls into a soft, almost velvety finish. Some people call that patina; others call it "why does my ring look dirty." There's no right answer, but you should know which camp you're in before you spend the extra money.

Prong wear is where my opinion gets specific. Platinum deforms before it abrades. That means a prong hit hard enough will bend, not snap. The stone stays in the ring, but over years of small impacts, prongs can slowly open like a hand relaxing. I had a client named Mark come back two years after a platinum solitaire. The prongs had spread just enough that we could nearly slide the diamond out with finger pressure. A quick re-tightening fixed it. But 18k white gold prongs, especially in a palladium alloy, are harder. They’ll hold their shape longer under friction; when they fail, they’re more likely to chip or crack than bend. For a clumsy wearer - and I count myself in that group - I'd rather have a metal that gives me a warning than one that stays silent until it doesn't.

Cost and resizing. At the bench, a platinum solitaire will run you about 1.5 to 2 times the metal cost of the same ring in white gold, and the labor for sizing or repair is higher because platinum requires different soldering setups and more care to avoid pitting. White gold sizes cleanly with standard gold solders. Tungsten can't be resized at all - that's a different conversation. Platinum can be resized, but it's never as quick or as cheap.

I own both metals. I reach for the white gold band three times as often.