![Ludo_with_mordant Ruby and Diamond Ludo Bracelet with Coordinating Buckle and Mordant.](https://www.langantiques.com/university/wp-content/uploads/elementor/thumbs/Ludo_with_mordant-q88jzvagjghx7j95hlvf2221qlwzq1lobrdj2jqetk.jpg)
A mordant is a metal piece, sometimes jeweled, affixed to a belt or bracelet on the opposite end from the buckle. The purpose of a mordant is to facilitate the sliding of the end through the buckle and under the slide. In jewelry, a mordant usually serves as a decorative way to finish the non-buckle end of a strap bracelet.