Of course, cutting the pearl is just half the battle. Now it's got to get in the wood. I tried just pushing it in with brute force but, no go. I guess I'll just have to do it the old fashioned way.
First, mark out the area, then tack the pieces into place with the tiniest drops of CA glue, one per piece.
Then, using a very thin mechanical pencil (0.7mm), trace around the pieces, being as thorough and messy as you can be.
Then the router begins using a Dremel in a base with a very fine tipped router bit.
After frequent checks to look for tight spots.
Invariably, there will be some gaps. At least for me (and Gibson, if you've ever seen an old example with shrunken parts). That's where the magic dust comes in. On a dark wood it's easy (and pretty much standard) to use dust from the same wood as a fill with CA glue. Ebony is a piece of cake (that's why you see it on headstocks the most) but walnut is pretty good. Light woods, like maple, are a nightmare. The dust turns dark from the glue and never becomes invisible.
I'll have to wait until tomorrow to get it sanded flush.