Handmade heat-resistant glass pendant top This is called "space glass." It contains artificial pearls. Planets of the universe are depicted using fuming techniques. Made of borosilicate glass (heat-resistant glass), it has high hardness and is unlikely to break even when worn around the neck. It's an unused item, as I only displayed it after purchase. A neck cord is included, but it has deteriorated, so please replace it with one of your choice.