Give it to the local Boy Scout troop so they can cut it into strips and burn it in a ceremony.
A spear and flag?
The photos are not closeups ,the only discolored areas I see are the solder lines,every thing else is out of focus.
Maybe an inside hole de-burring tool. @springfld.arsenal may know what it is.
Hard to tell where the stones are from,it is not spider web more like matrix. Examples of American turquoise,but nothing can be exact even from...
All of your photos are not in focus,did he tell what type of cut the diamonds are?
Looks like the design was chased.
Tourist souvenir possibly with replaced pin hardware.
Looks like a capped pearl tied to the ring shank with a "string".
But no one can say what was actually made in the trenches as there were no records kept. Most pieces called trench art were made in villages by...
Just guesses since photos don't prove much of anything............ hematite real or man made,glass and serpentine. Modern bead shop type.
Looks like it was cast,air bubbles and gas porosity.There may be a little chasing and engraving,but it's hard to tell from the photos.
Opal mosaic doublet ,costume jewelry quality. example..... https://goldcrownjewelry.com/products/opal-mosaic-oval-8x6mm-4-pcs/
Photo?
What is the figure on the left? I see a water buffalo,a "monk"and a moth.The figure on the left side is not distinct.
Not sure about quality,the solder joints are discolored for some reason and the prong settings look like they were made from sheet and misaligned.
Real info about black diamonds............ https://www.gia.edu/gia-news-research/gia-researchers-look-inside-black-diamonds
Brushed finish looks like file marks.
Looks like it was die stamped and not repousse.
It's a barrel clasp with a tongue,much like box clasp.
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