One frustration often shared with me by people who make resin jewelry is that once they sand off the rough edges of their pieces, they are left with dull, matte edges.
I have a quick tip I'd like to share with you that I use on all of my resin pieces after I sand them. I submerge the resin piece in water to remove the dust caused by sanding, and then I dry this off with a soft lint-free towel. I place a dot of Diamond Glaze on my index finger and lightly apply it to the sanded edges. Once the Diamond Glaze has dried, you can't tell any difference on where the resin ends and where the Glaze begins.
I would not, however, recommend using Diamond Glaze over the entire resin piece, as it is not as indestructable as resin is. It easily picks up scratches, so the overall beauty of your resin piece may not withstand years of wear and tear. Take it from me - stick with glazing just the edges and you'll come out alright in the long run.