Beautiful Modernist Silver & Malachite Brocch, from Germany

I normally do not collect post-war jewellery but I really fell for this brooch, and it was a gift. Although clearly modernist in style it is inspired by art deco. I think it must be from the 1960s. I think it is a unique piece made by a jewellery artist. It is marked 935 and signed but unfortunatelly I don't know who the maker is. It comes from Germany so I suppose it was made there. In any case, I love the combination of the materials, the malachite, coral, silver and silver gilt details.