The eminent and apparently OnePlus-focused leaker Max J. has posted a new image of this OEM's inaugural TWS earbuds on his Twitter feed. This one shows the other side of these stem-toting accessories for the first time - and also paints them black. Therefore, it seems the product will have at least 2 color options on their launch.
https://www.notebookcheck.net/The-OnePlus-Buds-will-come-in-black-new-leak.478301.0.html