If the gonjo of any keris were to be made with pamor ron duru, or with any other pamor miring for that matter, it would need to be made as a separate forging, and this is not usually the way a gonjo is made.
The normal approach is that we cut the material for the gonjo from the same forging that we carve the body of the blade from. Sometimes this gonjo material is cut before the steel core is inserted, sometimes it is cut after the steel core is inserted.
I think that perhaps the gonjo on your keris had its material cut from the billet after the core had been inserted.
In any case, after that piece of material is cut from the billet it is then forged to shape and the gonjo is carved from that smaller forging, once this is done, the pattern in the gonjo forging no longer looks like the pattern in the blade forging.
|