Hand crafted Pyrex and Soda Lime glass Retainers. Gorilla Glass and Glasswear Studios septum, navel and nostril retainers. Available in a variety of colors and sizes. Pyrex (Borosilicate) glass has a high resistance to thermal shock and requires intense heat when formed in to shapes and has a short working period. When it cools it has a tough, scratch resistant surface which makes Pyrex jewelry some of the most durable glass jewelry available. Gorilla Glass pioneered the use of Soda Lime glass in body jewelry. Soda Lime glass is widely used in food and beverage containers and art glass. It contains Silica, Soda and Lime in varying proportions.