These glass gem marbles are fired at an extra high temperature in the presence of mineral salts for a mildly iridescent finish. The glass of the gems is thoroughly opaque, and the surface shimmers with a reflective gloss. The appearance is striking compared to regular glass gems. Glass gem marbles are sometimes called craft marbles or accent marbles or glass gems. All these names refer to a glass gem that is flat on the back side for gluing to surfaces. Our glass gem marbles are great for picture frames, backsplashes, mirrors, encrusted sculptures, mosaic stepping stones, and even pictorial mosaics.

The gem marbles are sold in 12oz. bags, an average of 70+ gems. This is a nominal count only; the bags can contain less than 80 pieces when the gems are large. The gems have great variation in size by manufacturer batch. The average dimension is a diameter of 9/16", but this can vary by as much as 20%.