Hi,
It's not easy...
Your ring doesn't have "a table" to place your stone.
You could cheat with this problem to soft the transition between your two parts.
I send a proposition which is a blending between a cutted version of the ring and the stone part.
But I think, the problem is the type of bulby you done first which is very large in height and width.
I think it will be not confortable to wear it.
See the red arrows on illustration, those parts are too big, my own opinion.

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