Glasswear Studios produces the high quality Pyrex (aka Borosilicate or hard glass) and fused Quartz body jewelry. They offer over 1900 products in more than 174 styles. All Glasswear Studios products are proudly manufactured in Southern Oregon, USA. All of our jewelry is 100% lead-free, Barium-Free, autoclave-able and is computer kiln annealed Borosillicate (aka Pyrex) or Quartz Glass. Our glass is defined as: “The chemical composition and properties of SIMAX glass place it in “group 3.3” of clear “hard” Borosillicate glasses, characterized by their high heat-resistance and chemical stability, as defined by the international standard ISO 3585 and the Czech standard CSN ISO 3585. It fully complies with the requirements which these standards place on its properties.”