The Rolex Datejust 31 (Reference 278243) is a luxury ladies' watch that blends durable Oystersteel with elegant 18k yellow gold (a combination Rolex calls "Yellow Rolesor"). This specific configuration features a classic champagne dial, a versatile 31mm case size, and a reliable automatic movement.

• Case Size & Material: The 31mm mid-size case sits perfectly between the traditional smaller lady sizes and larger unisex sizes. It is crafted from a highly polished blend of 904L stainless steel and 18k yellow gold.

• The Bezel: The "24" in the 278243 reference number indicates a smooth/domed bezel made of solid 18k yellow gold. This gives the watch a sleek, modern look compared to the traditional fluted bezel design.

• The Dial: A beautiful champagne-colored dial that often features a sunray finish. This lets the light bounce off the face of the watch from different angles. Depending on the exact variation, the hour markers can be classic sticks/indices, Roman numerals, or factory-set diamonds.

• Μηχανισμός: Powered by the Rolex Calibre 2236. This is a self-winding automatic movement built completely in-house by Rolex. It features a Syloxi hairspring for excellent resistance to magnetic fields and shocks, offering a 55-hour power reserve.

• Bracelet Options: This watch typically comes on either a sporty 3-link Oyster bracelet or a dressier, elegant 5-link Jubilee bracelet. Both feature the two-tone steel and gold look down the center.