It's not a hard technique, just time consuming while you wait on things to dry. I discovered this while making my Mardi Gras mask last month. Hope you give this a try and please be sure to share with us if you do.
Use glitter glue on paper-I used punch scraps. Sprinkle on glitter. I used various colors and used both chunky and fine glitter. Let dry.
Add a layer of Diamond Glaze, Crystal Lacquer, or similar product and let dry. You will probably need at least 2 layers to get a smooth surface, especially using chunky glitter. Do not worry if it over flows, once dry you can trim with scissors. If you get bubbles or other blemishes that is OK, real stones aren't perfect either.