According to a recent rumor, one of the upcoming Samsung Galaxy S10 variants will feature a ceramic back, akin to Xiaomi products such as the Mi Mix 2 and Mi Mix 2S smartphones. It has been speculated that it will be the 6.7-inch Galaxy S10 model with six cameras that will be the edition to be adorned with a classy ceramic back.
https://www.notebookcheck.net/Latest-Samsung-Galaxy-S10-rumor-Xiaomi-inspired-ceramic-back.366176.0.html