Ebonised furniture - wood finished near-black rather than made from a black timber - has a long history for a practical reason. True ebony was scarce and enormously expensive, so cabinetmakers learned to stain and polish cheaper hardwoods to imitate it, building the colour up in many thin coats rather than one heavy one. Done properly the result is not a black paint film sitting on the surface; it is depth, with the grain still faintly readable underneath.
That is how this frame is finished, and it is why it does not look like a painted sofa.
The silver along the raised edges is the second half of the effect. A black frame with no highlight loses all its carved detail in an ordinary room - shadows cannot show on a surface that is already dark. A bright line along the top of each carved form restores the outline.
Our master Indian artisans apply it with the piece lit from one side, following the edge the light catches. It is the same discipline as gilding a dark frame, and it is slow work that only looks effortless.