Get the stone tested by a professional,it may be a chrysoberyl cat's eye.
If you are on Facebook there is a public NA jewelry group with a number of expert people and you can post the photo........
On the right one top pedal was cut off,the bottom was poorly soldered on possibly an earlier try to repair the piece. Can't see enough on the left...
Opal triplets were fun to make,cheap price $2.5 dollars from a state fair.....[ATTACH]
Here is the information......https://www.gemsociety.org/article/old-european-cut-diamonds/
Impossible to tell without testing.
[ATTACH] It is not Mokume-gane which has more than one type of metal......
The "stone" looks like 3/4's of a marble.
Possibly from Oregon.........
The "L" is totally different on Lee Charley.
The marks look imprints of the top design,the stone appears to be variscite.
Looks like Lee Chee...... https://www.art-amerindien.com/hallmarks/l-indian-native-american-jewelry-marks.htm
This is how a netsuke was worn..... https://www.dailyartmagazine.com/miniature-world-of-netsuke/
Post a photo of the "markings" on the inside.
So called Mexican onyx is actually dyed travertine/calcite.
Can't tell from the photos if it is faux Damascene from Toledo, Spain or actual Japanese made.
It's not a slot car,it's a hand push friction car.
The bezel was soldered onto the base and it looks like a piece of reticulated silver sheet was soldered onto the base plate around the bezel.........
I posted it was low quality in reply #5.
There is a number of fused silver dust and gold pieces here,but no earrings that are similar to your post......
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