An unofficial but free plugin available on ZBrushCentral that helps create precise ring band basemeshes.
ZBrush Ring Builder 5 is a specialized plugin designed for ZBrush, a popular digital sculpting and painting software. This plugin is specifically tailored for creating intricate, detailed ring designs with precision and ease. With ZBrush Ring Builder 5, you can generate complex ring models, complete with intricate details, textures, and realistic renderings. zbrush ring builder 5 free download
Once installed, here is a 5-minute workflow to create a custom ring. An unofficial but free plugin available on ZBrushCentral