U.S.S. Annan, Saturn class

That is my fan-made recreation of one of the starships seen is the season 3 of Star Trek: Discovery. It is a Saturn class USS Annan.

The ship itself is a big wedding ring without a diamond - with nacelles acting as a "holder" for the diamond.

The name and registry are not seen at all in the series, but they come from a databook "Star Trek Shipyards - Starfleet ships from 2294 to future".