This reminds me of some of Bob Henderson’s experiments with brass eyelets. He did some with a finish where he chucked them up in a dril and polished the top of the flange, creating an effect where the plating fades out to the raw brass.
https://www.instagram.com/p/DHyjlggpSfG/
If you’re really going for a jewelry look, the best surface finish I’ve seen on stock eyelets were definitely Hasi Hato branded ones from Japan. I got some through Rocky Mountain, who also import the matching hand setter tools. But @justletmechange just added another online distributor who will ship to the USA: Recommended Distributors List