The following information comes from the definitive Jasta 30 history by Bruno Schmäling & Winfried Bock. During the Spring/Summer of 1917, orange had not yet been established as the squadron color. The orange diamonds came in around November 17, on Albatros D.V's & later, Pfalz D.IIIa's. When the Fokker D.VII came along, the diamonds were no longer used, but most pilots used orange, in tribute to Hans Bethge, on major parts of the aircraft - fuselage, top wing, tail, etc. in addition to their personal colors.
Before late 1917, individual pilots were allowed to use personal color schemes, and there was no uniform Jasta marking. For Von der Marwitz, "Wine red" was his favorite color, and he also used light blue on struts and cowlings. The blue was the color of his original unit, shown in his cap band and uniform trim. Von Bertrab's band and uniform trim was black, and the authors state that he had a black fuselage. The cross outline is visible against the fuselage, which could possibly be due to the outline being a glossier black. In April/May, he just had the all-black fuselage (with white fuselage cross); by late May/June, he had added the "star", shown in the book profile as red with white outline.
Bruno Schmäling had interviewed the surviving members of Jasta 30 at length, and much of the color information is based on those interviews.
Pete