Titanium is pretty nice, have been pumping out aviation proximity housings made from it for over a month now.
Have a few more days on the current run of 200 with three ops plus or minus .002 on em, thought would be done but the got another order for 500 more of the others ones from last month. It is popular for being durable.
Sorry not ring related really, just mentioning it's a good metal.
Polishes up nicely
Have a Palladium necklace around here I used to wear, you actually made me think of that, the wife has squirreled it away somewhere.