No buckle,it's a pin/brooch for loose weave sash,shirt,etc. it is a ring brooch,the style has been around for centuries and used in many...
Edit your photos to "full image",the words are upside down and could be Tibetan,etc.
A kashira is Japanese sword fitting.The OP's appear to be for a Chinese Jian. examples......... https://www.engravingforum.com/showthread.php?t=7302
The long one is a scabbard tip,the other may be a pommel cap.
Green and some red in "carved" out pockets with a top coat of red.The red appears to have chipped away from a "silver" colored metal base. [ATTACH]
The leather finger protector is used by different craftsmen, leather sewing,etc. If you ever slipped while engraving metal without the finger...
Many metals can be enameled including steel..... https://www.enamelcenter.org/enameling-on-steel-kat-coles-marvelous-workshop/
Most look like metal engraving tools.The one with the "silver" locking collar should have a name stamped on it.
Looks like green glass melted into pockets carved into metal and then coated with red glass to maybe simulate opal. Appears the red glass on top...
@billyd3us How many sides does it have and what does the bottom of the crystal look like? There appears to be a couple of cleavage plains in the...
I like the Utah version better,it's a harder stone..... http://www.so-utah.com/grand-canyon-kanab/kanab-utah/wonderstone/
The knife is a "slip joint " folder,the blade has a "locking" flat area where the spring holds the blade in place when opened.
No,the silver colored pin in the red circle holds the tension springs which "lock" the blades in position when the blades are open.
The circled pin holds the spring in place to the frame.
How long is the sash?
Too out of focus to see the crystals,but looks like volcanic origin of some type. Do you know where it was found?
https://www.google.com/search?q=fiber+optic+gemstones&client=firefox-b-1-d&channel=tus&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiSwPDEzZHjAhX4JDQIHQ6eA...
It's a stone with a broken corner.
Probably not planished, but dapped on a wood dapping block.Planishing would be a bit harsh on the surface detail.......
Could be from a kit "Marquetry Inlay/Onlay Kit",the instructions and patterns have been in woodworking magazines for a hundred years or more.
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