I've posted Lorenz Bäumer's excellent jewelry before, and I cannot complain about his work in that sphere, but his work in digital renderings leaves much to be desired. I understand the desire to use renderings to promote unfinished pieces, the watch brands do it all the time, but put some effort into it!
I was all set to like the Mikado ring design, it even reminds me of a recently finished house that I liked, and then I saw the full size image. I know getting specular surfaces to render properly is not trivial, but every edge has that "I just hit the render button in AutoCAD" look
Once I saw it there, it was almost impossible not to see the same sort of digital artifacts in a piece I'd have probably not noticed but for the horror, the Toi et Moi ring.
(pictures from Paris Joaillerie)