Jens, thank you for your comment.
The decoration is not just "scratched" into the jade or other hard stone, but it to depth needed to allow the stone, once set, to be at the proper relative height to the hard stone matrix.
Once the linear aspects of the design and the larger cuts intended to support the set stones are finished, the edges are undercut slightly.
Once the 24K annealed gold is forced down, filling the undercuts, it's locked in by burnishing or chasing lightly.
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