Photo of the front is not in focus and can't see the detail.The back photo shows many solder balls and flow around the hinge and bezel.It has been...
Looks like it was electroformed.
Hard to tell where it was made,the 925 stamp wasn't used much until the late 1990's. Marker's mark stamp are fairly inexpensive now... start at...
Red stone gypsy/flush set,side stones are "burr" set.
Maybe a 333 gold mark.
Chinese seal stamps rough pieces.......
Here is a video of bead setting in a star,you can probably skip to the 10 minute mark. [MEDIA]
Hand wriggle engraved design,pearl mounted in an engraved star and bead set.
Nepal has 17 species .... https://www.inaturalist.org/guides/8873
Is it actually tension set or channel set? The first tension set ring was produced in 1979 in Germany.
Possibly variscite.
Possibly @Kaiserpoo if he still checks in.
Your piece would be called an okimono.
Where are the holes for the cord?
This is what is inside many iron bearing meteorites ....[ATTACH]
The original is here ....... https://bnn.network/history/the-mysterious-mermaid-of-the-british-museum-a-fascinating-tale-of-monkey-and-fish/
Possibly a fox and hound hunting group in Pennsylvania.
https://www.antiquers.com/threads/posting-a-thread-and-uploading-pictures.15990/
There is also Japanning metal for various types of metal......
Sterling can "tarnish naturally" or a patina solution can be applied with various results........
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