Ranging on the more expensive side, fire glass will likely cost you about $25-$35 for a standard 10lb bag or $2-$3 per pound for more unique styles. Fortunately, this type of media is not akin to decomposing and can be used over a two to four year period before it needs to be changed. But, it is also pertinent to note that you’ll have to fill your fire pit with a 2-4 inch layer to get decent coverage. A modest 10lb bag of lava rocks will only set you back about $7-$25. On average, lava rocks provide the best bang-for-buck price range. And, not to mention that they also create a stunning display of flickering tones and light when set against an open flame. Likewise, fire glass also sports vibrant hues from green, yellow, and the more popular blue – which is the most prominent due to its high contrast with the orange-red tones of fire.įor most, fire glass is the way to go as these have more flexibility in terms of color, shape, and size range. Since they’re man-made, fire glass comes in polished and smooth shapes and sometimes, uniform sizes. With fire glass, you get the opposite of lava rocks. But, before opting for these, make sure that you read the fine print as these hues are due to dye and can be potentially toxic once exposed to direct flame. However, there are some vendors who sell lava rocks in more vibrant hues like green and blue, and some even come in polished oval shapes. Lava rock often come in jagged and irregular shapes, owing to the fact they’re harvested raw or as is. These naturally occurring stones usually come in a variety of sizes and in three main colors: red, brown, and black. If you’re looking for a more rustic and organic aesthetic, then lava rock is your media of choice. In terms of appearance, it really boils down to personal preference. However, for those who live in colder regions, I highly suggest fire glass as these will keep you warmer for longer periods of time without draining your gas too quickly.

You can expect at least an hour of afterglow warmth for fire glass.įor those living in more humid or sunnier climates, lava rocks are great for cool evenings as they don’t retain or disperse too much heat. Therefore, you’ll likely use less propane or natural gas to get to that ideal temperature. On the other hand, fire glass is known for even heat dispersion and conductivity – its reflective nature makes them ideal for spreading warmth evenly and efficiently. Lava rocks can provide 45 minutes to an hour of afterglow warmth after you turn off your gas tanks – depending on the intensity of the fire prior. You’ll likely encounter uneven warmth distribution, and a short lifespan of heat retention once the flames are gone. While this makes it great heat conductivity, it leaves much to be desired about even heat dispersion.

Generally, lava rocks are porous in nature.

Glass rock for gas fire pit