Use our Decorative Fireglass with fire pits and gel burners. This brilliant colored glass is a stimulating way to enrich your fire side experience.Reflective quality enhances the fire and its surroundings. Can be used with or without lava rocks. Cut glass adds distinctive decor to your indoor or outdoor fire pit. Can withstand temperatures up to 1800 degreesF. Frontgate Safety Recommendations. WARNING: Combustion byproducts produced when using this product include carbon monoxide and other chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov..