Platinum Group Metals have been available at rwmmint.com for a while, but only in troy ounce ingot form. Now there's 24 karat Iridium rings so you can wear your Iridium!!
Clearly you don't want to see in 2017 as Osmium is one of the most toxic metals out there - when metallic osmium is exposed to air it forms osmium tetroxide which is about 2000x more toxic than mercury. An osmium ring is just what the doctor ordered.