The OnePlus 9 Pro is a 2021 flagship Android phone launched in 3 color choices, one of which evinced the brand's signature Sandstone Black. However, according to the reliable leaker Max J., the OEM once considered a very different new option: Matte White. It also apparently mulled other, glossy finishes for its latest premium devices that ended up never seeing the light of day.
https://www.notebookcheck.net/OnePlus-9-A-leaker-reveals-what-could-have-been-with-allegedly-rejected-colorways.537461.0.html