"Hold On" is the name of the clasp..... https://www.worthpoint.com/worthopedia/antique-pearl-stick-pin-hold-clasp-490579073
It is an ojime bead " cord fastener" for a Japanese inro.
Probably every piece of silver you have which has been soldered on is "soft",it is a fact of life. The modern argentium silver can be heat...
The seams on the Navajo beads has solder all over them,so you were testing 70% silver. The cones seem to marked but I can't read them.
Need better photos of the top of the 1st ring,the channel ring could have been made by anyone,There have been classes taught by Native Americans...
Use the unglazed back of white tile and you will see the color better.
There is many people who make new jewelry better than some of the antique pieces. Some of them use the dies and wheels which were made pre-civil...
The omega clips are probably 18K since 22K would not hold the tension for very long.
It looks like there are air bubbles in it,what can you see?
Looks like a type of "swirl" marble.
Platinum can be magnetic.
The rectangle pieces were cast and look like junk with casting bubbles. Platinum jewelry is rhodium plated by many manufacturers.
I thought it looked a little like chrysoprase, but it's hard to judge with a photo. They didn't much stabilizing with resin until the late 1960's.
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