MSI Fire Glass LFIRGSAPBLU0.5CRU20 0.5” 20 lb Crushed Sapphire Blue Fire Pit Glass offers rich blue, jeweled tones that shimmer against rays of light and flickering flames of fire, indoors or out. Introduce a new level of elegance to your fireplace, fire pit, landscape design, garden, water feature, or aquarium. These crushed glass stones withstand intense heat and a range of weather conditions.