Borosilicate glass is a type of glass, and it is often sold under the brand name Pyrex glass. Borosilicate can withstand much more severe thermal stresses than ordinary glass without breaking, and when it does break, it tends to crack rather than shatter like other glass. It is chemically inert and as a result highly biocompatible – especially used for body jewelry. Though it is still a glass, borosilicate is one of the most inert materials available for piercings where simple, larger gauge jewelry is an option. Most people who cannot wear metal, acrylic, or ogranic jewelry without irritation have no problem with jewelry made out of borosilicate glass. Borosilicate glass jewelry comes in a huge variety of colors and beautiful designs.