I like the patina myself, and then a polish over for highlight. Gives a nice "earthy" look to things. Some of the people I talk to at the craft store say there are products you can spray on the piece to stop the oxidation. Never tried it though. It doesn't take much to give the pieces I've made a quick buff, so I keep it natural. Of course you could use a copper enamel that doesn't tarnish too. Either way, I hope you find a labrodorite to try it. I'd love to see how it comes out.