Info here..... https://www.opalauctions.com/learn/did-you-know/what-is-potch-and-what-colors-is-it
Is the metal magnetic?
It's hard to see what it really looks like from a photo.... The bail appears to hand stamped wire,the bottom border possibly twisted wire filled...
25-30 years ago you could not mark pieces with more than 1 type of metal,besides that the "gold" piece is bezel set like a stone.
Information of metals used and stamps in this Etsy post... https://www.etsy.com/listing/786825840/patented-california-convertible
If it isn't marked they are probably gold filled.
It looks like an absinthe sugar spoon.... https://www.etsy.com/listing/1304464118/french-vintage-absinthe-spoon-sifter
The pink one maybe a rose quartz geode with an electroformed setting.
Circled casting flaw,circled long areas appear to be a particularly soldered inner liner. Other areas unclear in photo and probably visible in...
Maybe take a closer look,where I worked it would have gone into the recycle bin long before the prongs were soldered on and the stones set.
Possibly made by a student/hobbyist,I don't think a professional would sell a ring with a poorly made shank.
It's a commercially made buckle,they used to be advertised in a number of jewelry catalogs like Grieger's jewelry supply.
It's a real ring......
The modern round brilliant design was invented in 1919.
Hard to date without maker's marks,it took years for casting to take over the process. During the war effort of WW2 casting evolved much more then...
At the Potter link above they have hundreds of dies which were rescued from the trash when the shops in New England went to casting. Hugo Kohl...
Looks like a cast copy.
If you are interested in other jewelry and how some are made take a look at Hugo's website and videos. https://hugokohl.com/...
To increase your knowledge there have been patterned rollers since before the 1860's,examples below.......
From the description and appearance it doesn't seem to be NA made,it looks like it was made on a rolling mill.
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