You use the upper crown (does not need to be screwed down) to rotate the inner ring that moves pretty easily with 120 clicks around the dial. Over the dial is a flat sapphire crystal with AR coating for reduced glare.diamond watches for saleArriving with the watch are two silicone straps. There is a black and bright red strap available for you. The tropical style straps were designed specially for the Ocean Diver watch and have 22 mm width. As they are made in silicone ladies diamond watches they get very comfortable.To order this Automatic Mens Watch model is very easy and should be similar to experiences you had before of buying discount diamond watches or other things. You just have to visit the online watch store of Prometheus to place an order.Prometheus Ocean Diver GMT a true Automatic Mens WatchThe Prometheus watches with diamonds is the result of a project coming true from acompetition at Watchuseek Watch Forum and is made by Prometheus Watch Company, a boutique watch company specialized in production of mechanical watches.