Jerome

And I placed a jewel above the mouth or nostrils. The Hebrew word 'Nezem' (except for Symmachus, who interpreted it as 'ἐπιῤῥίνιον') is translated by all as 'jewel'. Not that the jewels are placed in the nostrils that are called earrings because they hang from the ears, but so that the circles made in the likeness of earrings are called by the same name, and even today among other ornaments of women, golden circles are accustomed to hang from the front of the mouth and hang over the nostrils. …

Commentary on Ezekiel ↗