What types of meteorites can I use for making a wedding ring?

Iron-nickel meteorites are made of metal alloys, either kamacite, or taenite.

But I'm a little sceptical about whether it's a good idea to make a wedding ring of it, since it may oxidize over time, and it may contain toxic elements like cobalt, or it may cause nickel allergy.

It's probably better not to use it for direct contact with skin, or humidity.
However, etching it to reveal Widmanstätten patterns may look good.
Better protect it from skin and air, e.g. by melting it into something like a glass containment. Account for different coefficients of thermal expansion between meteoric material and containment.