Unlike many other timepieces that have a similar appearance (that is, those that are "dive style"), the Chanel J12 Marine is a bona fide diving watch. Designed to withstand the stresses of a high pressure underwater environment down to 300 meters, this watch is undoubtedly one of the most rugged Chanel luxury watches ever created. Evidence of this watch's brawn is immediately apparent, even to the untrained eye; the J12 Marine sports a high-strength anti-reflective sapphire crystal that covers the entire watch face, including the outer circumference of the bezel, which is, by itself, a masterpiece of seamlessly integrated function and form. Engraved and outfitted with either a blue or black high-tech sapphire or ceramic dial with luminescent markers, the unidirectional rotating stainless steel diver's bezel was designed with ease of orientation in mind, even under the most challenging conditions. The Chanel J12 Marine's stalwart 38- or 42-millimeter wide ceramic case is available in either a stunning white lacquer or a sleek, Marine-style bead-blasted black matte finish. The screw-down steel crown, sporting a ceramic cabochon, is equipped with a crown protector to prevent damage during vigorous activity. The Chanel J12 Marine's dial is available in either black or white lacquer, and, like the bezel, it bears strongly luminescent hour markings and hands for supreme ease of reading. The J12 Marine employs mechanical Swiss automatic movement for superior accuracy and a 42-hour power reserve to reduce the need for having to adjust the time, even after an extended period of inactivity. Finally, a waterproof, vented, shock and UV-resistant matte rubber bracelet completes the Chanel J12 Marine and further establishes it as one of the most practical Chanel timepieces.