![Reverse View of Antique Amethyst and Garnet Spider Brooch Featuring the Pinstem. Reverse View of Antique Amethyst and Garnet Spider Brooch Featuring the Pinstem.](https://www.langantiques.com/university/wp-content/uploads/elementor/thumbs/Pinstem_on_Spider_Brooch-q88jzedd4furejxq8ek4t6br1o8dvhqi9fmsfkfhxk.jpg)
A pinstem is a jewelry finding affixed to the reverse of a brooch, pin or tie tack specifically designed to pierce fabric for the purpose of fastening the object to an article of clothing. The hinged pinstem on a brooch is usually held by a clasp or catch, ranging in design from a simple “C” to one with an intricate safety mechanism.