Looks like they are real ivory and not one of the hundreds of resin copies made....
Older thread with letter openers..... https://www.antiquers.com/threads/native-american-silver-letter-opener.43085/
There has been a lot of Chinese faux/fake Dzi beads for over 30 years.
Looks like a poor casting full of porosity,could be someone's attempt to copy an original piece. Silver oxidizers........
The purple stone may be charoite or sugilite.
David Yurman made a number of amethyst and sterling acorn pendants,yours does not look like his style though.
In the 4th photo is looks like a 6 sided crystal,there is a lot of choices, it looks like it might be beryl. see 6 sided crystals......
It doesn't look like agate,how many sides does the crystal in the 4th photo have?
Shine a light through the bottom of the stone ,look at the top and see whats inside.
The top 2 look like questionable assembly to start with or poor repairs,excess solder on most joints and solder in places where it shouldn't be.
I have been wearing it for 30 years,copper and silver twist pattern.I wear the more expensive 14K palladium white gold and silver for special...
It's a cuff bracelet,the size is the same as I wear and I'm not the size of a child.Since it does not have a maker's mark,anyone could have made...
Looks like labradorite and ammonites.
Looks like cast resin.
Size?
XRF scanner,try a local college,pawn shop,jewelry store........
https://www.google.com/search?client=firefox-b-1-d&q=tomahawk+comix+book
It's not hard,you just need gold testing needles.... https://www.jewelrydisplay.com/jewelry-tools/testing-needles-testing
https://www.antiquers.com/threads/testing-gold.77921/
They look like something from Avery Creations.... resin castings....
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