I used to have a ring with his hallmark that I felt was legit, but I lost it years ago 
My ring was a very different style than what you have, but if I remember right that’s what the hallmark looked like. And obviously we know that stores make mistakes, but I did get it at a museum gift shop in AZ.
That is a beautiful stone in your pendant!!
You know what, thinking about it, I think mine just said “Shakey” or “R Shakey” and sterling with no first name, but I may be remembering that incorrectly. Plus there’s not a lot of room on a ring so he may have used two different hallmarks. But I really have no clue, I haven’t looked into it.
I don’t know about the name, but love the pendant. I love the green and blue and browns of the stone!
I’m guessing Royston
Thanks I like it too - I felt like the price I got it for was reasonable for the size of the stone ($120), so that makes me like it even more!
@Emily Not sure how I missed this thread. That’s a fabulous pendant! My comfortable guess is that it’s Royston turquoise.
Gorgeous pendant. I have two or three of his pieces and none are similar. In fact one cuff is oxidized completely black with applied moons and stars. I think he worked in different styles.