This watch features an 18kt yellow gold case with polished finished edges & a brushed/satin finished top. Crown: Patented “Triplock” locking crown crown ensuring that the crown screws down onto the Oyster case as securely as a submarine hatch and a Polished 18kt yellow gold. Bezel: Bi-directional rotating bezel with 24-hour markings, Polished 18kt yellow gold rimmed with a ribbed edge for a sure grip, Black “Cerachrom” bezel insert, made of highly durable ceramic that is extremely hard that is highly scratch-resistant, has excellent corrosion resistant properties & is unaffected by ultraviolet rays so the color will not fade, and Matte yellow gold coated numbers & graduation indexes. Bracelet/Buckle: Solid 18kt yellow gold bracelet with brushed outer links, polished center links & polished edges, Oysterlock double-locking deployant clasp, and Fitted with the patented Easylink 5mm extension link. Dial: Green dial, Applied polished yellow gold-rimmed hour markers with luminescent fill, and Polished yellow gold hands with luminescent fill. GMT/2nd Time Zone Function: GMT/Dual Time zone is indicated by the hand with the luminous arrow-head tip pointing to the 24 hour indications on the bezel and NOTE: The GMT hour hand makes a single revolution once in 24 hours. Rolex Caliber 3186, beats at 28,800 vph, contains 31 Jewels & has an approximate power reserve of 50 hours.