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I have a metal bracelet with inlaid strips of wood approximately 0.5mm thick. Unfortunately I have lost one, so am planning to replace it.
The two challenges I have (aside from sourcing wood that matches - but that's a separate issue) are:
I think that a great way to transfer the shape to the wood would be to use a rubbing to create an outline of the space which you can then cut out of the paper and transfer to the wood. This is sort of reminiscent of how Indiana Jones saved the instructions for finding the grail from the shield under the library:
You can use either a crayon or chalk or pastel or some similar flat-sided medium and a piece of thin paper like tracing paper or tissue paper.
The high points on the bracelet should be colored in and the relief area you're trying to fill with wood should stay either white or be much lighter in color.
If you've held it still enough, you should have the exact shape you need. At this point, you might want to make a copy or two of your rubbing so that you can cut it out of slightly thicker paper and preserve the rubbing so you don't have to redo it.
Be certain to cut it out slightly larger than necessary so that you can allow for final shaping to be done as you're sanding after cutting out the shape.
If you take your time, you should get an excellent fit out of your wood inlay.
I don't want to focus on creating the shape outline as Catija's answer is a very simple approach for something like this. If this was a little bit different then other options might be viable as well. Perhaps using Plasticine or silicone to create a mold of the void. It would allow you to trace around the mold you create and get a gauge on depth. Unless you plan on repeating this those options are not very efficient.
When creating the veneer you have a couple of options. You could cut out the shape from an existing veneer piece or cut your shape from larger stock and slice the veneer off of that. If you are just cutting preexisting veneer a craft knife might be enough. Warning if you go that route to not attempt to cut all way though at once. The knife could catch and follow the grain potentially ruining the cut.
A bandsaw would be a well rounded tool in either case. Using a fine tooth it will make easy work of the template and reduce the amount of sanding potentially required. Beware of the kerf when cutting your veneer. Cut outside the line you made.
If you don't have veneer or the veneer you have does not fit inside the void perfectly then you might have better luck cutting your own veneer (too large is fixable by sanding but too small is harder to recover from.). Use stock large enough so that you can maneuver around the bandsaw with your hand comfortably away from the blade. First, bring the fence ~0.5mm from the blade and push through. Consider making it a little thicker and sanding the face because I cannot tell from the photo if the wood is perfectly flat or contoured. With your new perfectly size veneer you can now cut it to shape.
If you want to get cleaner cuts on your veneer when using power tools like the bandsaw you can always sandwich the veneer inside some sacrificial wood. This will reduce the tear-out on the veneer to nothing.
One major point about cutting your veneer is make sure the length of the shape you are making follows the grain of the wood. If you cut it against the grain is will weaken the wood making it easier to break in half. Notice the grain direction in one of the other partitions of the bracelet. You should cut the veneer the same. While it might be fine once set you will notice a difference if you are sanding it or maneuvering the veneer.
Click image to enlarge
