Just like logs inside of fireplaces can help make them look more like wood fireplaces, ember beds can also have a similar effect. There are several different styles of ember beds you might find with gas fireplaces. Some can be very simple and subtle. Others might glow a bit when exposed to flames the same way the ends of the logs sometimes do. This will heavily depend on whichever specific fireplace brand you've purchased. In most cases, additional features that help with realism will add to the price, so make note.