Dainty Black Tungsten Thin Ring

Zhedora

Thin, plain black band, Smooth finish (appears glossy in source), Dainty profile matches source, Category (band ring), Color matches exactly

Tungsten Wedding Band

Etsy - Foreverings

Plain black band, Similar thickness, Category (band ring)

Bling Jewelry Plain Simple Dome Titanium Eternity Band Ring Comfort Fit 6MM - Black 6mm

Macy's

Black color, Plain band ring type, Simple dome profile, Glossy finish, Consistent width