When we lived in Oregon,Glass butte had obsidian you could pick up off the ground.We could fill a 5 gallon bucket with rainbow,mahogany,silver...
Possibly Mexican obsidian.
The earrings with black background and flowers may be niello,do the round ones above them have a texture?
Here is the article,made in the Philippines and Pakistan also....
They are considered midshipmen until they graduate.
It could be Indonesian.
Marines don't wear Navy uniforms,but there are Navy sailors who wear Marine uniforms.
The clasp looks like a sloppy replacement.
Upper right looks like a Karasu tengu mask.
Photos are too small... https://www.antiquers.com/threads/posting-a-thread-and-uploading-pictures.15990/
The way they are faceted.
The stones are 20th century.
If the top was glass/quartz/sapphire it would look the same.
Hard to tell from a photo,but it could be an Andamooka matrix opal.......
Conch bird belt, SW/Mexico.. example. https://www.ebay.com/itm/275143002306
Looks like a bad repair on the bracelet and soldering the 2 half round pieces was poorly done.
It's eye agate from unknown location.
Looks like opal in matrix of some type.
Possibly a flag pole finial.
https://war-relics.com/product/smgr-0079-miniature-1914-iron-cross/ Example.....made of pot metal
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