I used a product from Diamond Fire Glass in my gas fireplace that I purchased online at
www.diamondfireglass.com
It is AMAZING how much more heat the glass crystals create vs. the artifical log set I previously had. The colors of glass crystal pieces are sparkling and reflective so the flame creates a virtual light show and flickering effect that is quite unique and clean. This is truly a Green product and I would reccomend to all.