Diamond Cay refers to the anchorage in the notch between the east end of Jost Van Dyke and the west end of Little Jost Van Dyke. There are both FCFS mooring balls and Boatyballs. Foxy's Taboo (and bubbly pool) is located on one side and the B-line beach bar is on the other. What's left of Sandy Spit is just outside the anchorage, and Sandy Cay is just south of the anchorage. I don't know about anchoring, someone else can answer that question. It is a nice enough overnight option. Last December we had a young boy in a dinghy come out to ask if he could bring us anything. We couldn't turn him down so we asked him to bring us a couple of bags of ice, which he did.