And it seems that the ring, from which the casting was done, has been enlarged by a jeweler which seems -what I can see from the pics- 1.) has not the proper material traces (as it is cast) and 2.) has lead to certain additional "borders" due to casting.
There is also something what looks like a, for this case, simple, improper "seam".
Interestingly the enlargement has been camouflaged by slanting lines.
Regards,

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wotan, gd.c-b#105

"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.