I've used metallic meteorites in jewelry, but they were difficult to work with. It doesn't cut well using the diamond saws that work with other lapidary materials, for some reason, so I had a struggle with it just in getting the shape I wanted. But the really bad part came later, after the piece was set. Apparently some water from the cutting process got trapped in invisible pores and cracks that reacted with the nickel-iron and oozed out in liquid form. Rust started forming on the surface; it seemed like the whole thing was unstable and wanted to deteriorate in a fairly short period of time. I suppose there's a way of dealing with that - boiling it in paraffin wax or some kind of polymer might have helped. But it would either take some experimentation or an authoritative recipe to make something I'd be confident enough to sell.
Tektites (Moldavites are one kind), by the way, are not the same thing as meteorites. They are glass that's formed when a meteorite hits the earth, and instantaneously heats the impact crater to the melting point of silica. The drops of molten glass splash away from the point of impact and are found widely scattered around the area. They often have interesting surface patterns, and don't have the same issues with cutting and setting as the meteorites themselves.