What I refined myself: the first passes shrank the image to a dot inside a grey glow instead of mirroring it. I checked each fold frame by frame and sent specific corrections (fill the frame edge to edge, centre on the object, bloom only on the two peak frames, effect fully off outside the folds) until it rebuilt correctly. Facets escalate 6 → 12 → 24. A fourth fold on the diamond kept rendering as an inverted white field across several passes, so I cut it by hand and end on the clean diamond.