A third color variant is now available for the OnePlus 5. The new "Soft Gold" model is a limited-edition handset that features the same specs and price as the black and gray versions of the device. There is also a new Slate Gray model with increased memory.
https://www.notebookcheck.net/OnePlus-5-now-comes-in-Soft-Gold-color-Slate-Grey-model-gets-a-spec-bump.240384.0.html