Chalcedony bangles

A pair of chalcedony bangles. Metal is unknown, likely jeweler’s brass with gold plating that includes some wear as part of the design. These look like they did when I bought them a few years ago. Rarely worn - my hand is a smidge too wide and, as much as I love them, I hate trying to get them on and off. They need a new home! Prefer to sell as a pair, will sell individually