The TUDOR Black Bay 31 S&G watch is powered by an automatic movement within a 31mm stainless steel case. The yellow gold bezel is set with diamonds. A yellow gold screw-down winding crown displays the TUDOR rose in relief. The silver dial reveals diamond hour markers. It is protected by sapphire crystal. The stainless steel and yellow gold bracelet includes a deployant clasp. Waterproof to 100 meters.