Owain, there is a higher section of the Order of Oman, I saw them being made but I didn't make any, they were actually made by Asprey jewellers in Bond Street, they were the same shapes as the 3rd and 4th stars but were set with diamonds. I forgot to mention that they were all made from 18ct white gold. I was involved in the manufacture right from the start of the order in 1970 when Qaboos came to power, I worked closely with the designer and back in those days Sultan Qaboos really liked white gold and all of the original order designs by Asprey were a mixture of golds so the designer had to re paint every design into white gold only before they were accepted. Over the years Sultan Qaboos has been one of our best customers in the trade, the last job I worked on was two pairs of gold table lamps, made as a gift for his 70th birthday. I made this for his palace bedroom back in the late 1970s.