Reddit reviews Kriskate & Co. Stainless Steel Black Plated Ring - Size 14

Some people have mentioned tungsten, and at least one of them actually meant tungsten carbide. Tungsten carbide is very hard, meaning it is very difficult to scratch. It is not impossible to shatter with an impact that would only dent/scratch a metal ring. I recommend searching Amazon for something like "black steel ring". This one is not the one I got, but it's similar. I've only managed to scratch it once, on what must have been a particularly rough stone wall, and they're cheap enough that it's not a big worry.