I also vote Royston. I have a 70’s necklace with a piece of Royston that looks similar to the #8 that you see now. After a number of years of researching the hallmark, some girl jumped on here one day and halfway identified the hallmark (couldn’t remember the man’s last name) as the man who worked with her father at the Royston mine when she was young. He made jewelry and she had a couple pieces and said her mother also had some. She was supposed to post again but just vanished. I will see if I can find the original post. Beautiful old turquoise necklace with pendant market "RISTA"
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