American Fire Glass AFF-BLKLST12-2.0-10-J 1/2" Black Luster Fire Glass 2.0 10lb Jar. Black Fire Glass is back and better than ever. Fire Glass 2.0 is specifically engineered with a luster finish on all 6 sides; this means your fireplace or fire pit will encompass the perfect amount of shimmer and shine. Our Black Fire Glass 2.0 is sure to please in any environment. Rather you use fire glass indoors in your fireplace or outdoors in a fire pit, it will stand up to the test of time.