Brazil: Aventurine is a form of translucent quartz or quartzite famous for its shimmering or glistening effect, known as aventurescence. This unique sparkle is caused by tiny, plate-like mineral inclusions (such as mica, fuchsite, or hematite) trapped inside the stone. Beautiful stone that took a great polish set in a sterling silver bezel and comes with a sterling silver chain. This item qualifies for free shipping.