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There look to be hallmarks on the back of the case, but too hard to read. Swiss ones on watch cases that are 750 are usually the bust of the Helvetia Woman.
The clasp seems to say 750, which could translate to 18 carat, but I don't know what the two triangles in the rectangle mean. Could by the maker, could be the assayer. Best to take to a jewellers to verify the metals. As for the watch, you'll probably only know if you open the back and look at the movement.
Here a similar reference on sale:
https://www.aaronfaber.com/product/18k-gold-ruby-and-diamond-omega-cocktail-watch/
Article described as:
18k Gold Ruby and Diamond Omega Cocktail Watch
Get a jewellers to take the case back off and take a photo of the inside caseback and the movement.
Omega made thousands of ladies cocktail watches in jewellery style over the years so it may be hard to find one similar.
Pictures inside may give a year it was made.
It will be valued at gold content mainly as these are not overly collectable like men’s watches.
I think I can see a french 18k gold hallmark on the case back. Does your family have a connection to France?
As said above the bracelet is likely 18k too.
I just found this picture in Omega - A Journey Through Time.
Different dial version but maybe good for further reference.