There was a post back in 2019 about a concho belt that looked to have the same AB hallmark as your earrings. There was no conclusion as to maker on that post. https://forum.turquoisepeople.com/t/recognize-the-maker/4155
My guess on the earrings are that they are both NA made but hallmarks are unknown. Same for the bracelet. The RS could by Raymond Secatero or Roger Skeets but neither are known for shadowbox designs. I really like the cuff and shadowbox designs can be quite light and still be high quality. And I love stampwork so I would be drawn to the cuff and the earrings.
If I saw them at an estate sale I would buy them too. My buying requirements are: it has to fit and it has to be something I would wear. My decision when I started buying was that it would be a personal collection of wearable art. There is so much to buy out there that if I bought totally indiscriminately I would be broke. So if the ring doesn’t fit I don’t buy it (for example) even if I could size it up or down. I just have to say Nope it wasn’t meant to be.
I guess without provenance I would be willing to pay $50 or so for the earrings and maybe $150 for the cuff. But I really know less to nothing about value, especially if I can’t touch and inspect it. But I would probably try and work a deal since I was buying all three together. Course it makes is difference if you are buying on 1st day of an estate sale.