Yup. Those are the ones. Theiss repurposed a lot of cheap costume jewelry of the era for badges, medals, and other Trek accoutrements.
I believe they were also worn by Starfleet top brass.
@JamesCawley showed us some at the Fleet Workshop prop meet-up at the Star Trek: The Original Series Set Tour
The only difference I see from what you have is that the interior spirals on yours don’t have the half spheres pattern on them.