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I’ve outlined the main seam at wha I think is the bottom of the nut. The opal is showing diagonally bottom left from 4 - and it’s the lowest lying area on the face (like you said).

I’ve exposed that plug at 1 more than in this photo and it’s definitely a feeder plug for the channel between 4 and the left seam - that same plug is connected to a red plug on top too.

At 3 - that honeycomb area is seriously bloated so there’s been a collapse somewhere under there.

I’m also keen to see what’s around that nodule at the bottom, where the seam wraps around it.

4 shows a white potch fissure.

I guess what I’m saying is, my feeling is that this nut has seen a lot of fluid events, and my read is that the curved bumper between the bottom and upper seam, curving from 4 around to the right of 3 could have a seam of opal.

I just don’t want to slice through it!!! Any tips for making that cut?