You are right there are no marked for this. We where on a tour that also included Dubai, Abu Dhabi, and a few other places. Had no ide of beduine jevellery except from what I had seen in Tunesia in 1978. At that time I was at school and almost broke. And as I was not collecting, more interested in other Things :-)
When we where in the old town of Muscat I bought the box in the old bazar. They had a lot of different Things. All was priced per gram and a rather high Price per gram. I bought the box. Later we visited the museum and I descided to get to know more. And to buy more. We had several stops in UAE and Dubai so we left Muscat. At our Next stops I only saw jevellery when we visited the small private Collections/museums. Nothing to buy.
My box is part of the Mystic Oman - a fast disappering thing. Modern Oman has less place for the Mystic. Rest of UAE and Dubai is new, they dont care for the old.
In Abu Dhabi and Dubai they build and expand. What I have seen its higher, bigger and more spectular - but history lost.
In Oman they also build - in these Buildings I see the history. They keep the history in the new style.
Thats my judgement from a short visit. Proberly unfair, but that was what I saw.
More reading regarding juvellery here http://islamic-arts.org/2012/silver-speaks/
And you are right - beduine juvellery is not wanted anymore. I like to explore so I will get a bit more.