Rolex
Rolex Datejust 31 178278
The Rolex Datejust 31 (reference 178278) is a 31 mm 18k yellow gold watch with a black dial. It runs on the automatic caliber 2235. It is no longer in production.
Specifications
Case
- Reference
- 178278
- Collection
- Datejust
- Case size
- 31 mm
- Case material
- 18k yellow gold
- Case shape
- Round
- Crystal
- Sapphire
- Bracelet / strap
- President
Dial and bezel
- Dial
- Black
- Bezel
- Fluted
Movement
- Movement
- Automatic
- Caliber
- 2235
Production
- Production
- Discontinued
Dial versions
This reference was made with these dials and finishes.
178278 Black
178278-0065
Diamond-set indexes · Diamond (dial indexes)
How it compares within the Datejust family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 178278 (This watch) | 31 mm | 18k yellow gold | Black | 2235 | — |
| 126200 | 36 mm | Oystersteel | — | 3235 | 2018– |
| 126233 | 36 mm | Yellow Rolesor (Oystersteel/18k yellow gold) | — | 3235 | 2018– |
| 126234 | 36 mm | White Rolesor (Oystersteel/18k white gold) | — | 3235 | 2018– |
| 126284RBR | 36 mm | Oystersteel / White gold | — | 3235 | — |
| 126300 | 41 mm | Oystersteel | — | 3235 | 2017– |
| 126331 | 41 mm | Everose Rolesor (Oystersteel/18k Everose gold) | — | 3235 | 2017– |
| 126333 | 41 mm | Yellow Rolesor (Oystersteel/18k yellow gold) | Champagne / Black / Silver / Blue / Wimbledon slate / various | 3235 | 2017– |
| 126334 | 41 mm | White Rolesor (Oystersteel/18k white gold) | — | 3235 | 2017– |
About the Datejust family
The Datejust appeared in 1945 as the first self-winding wristwatch to show the date in a window, together with the Jubilee bracelet designed for it. The Cyclops magnifier over the date followed in the 1950s, and the combination of fluted bezel, date window and Jubilee bracelet has stayed the model's signature ever since.
The catalog covers several generations, from caliber 3135 references to the current 3235 models: the Datejust 41, such as refs. 126300, 126331 and 126333, and the Datejust 36, such as refs. 126200, 126233 and 126234. Variants combine steel, Rolesor and gold with smooth or fluted bezels, Oyster or Jubilee bracelets and a very wide choice of dials. For dealers the exact dial, bezel and bracelet combination is what separates otherwise similar watches, so they are always described together.
Quick answers
- What size is the Rolex Datejust 31 178278?
- The Rolex Datejust 31 178278 has a 31 mm case.
- What movement does the Rolex Datejust 31 178278 use?
- It uses the automatic caliber 2235.
- Is the Rolex Datejust 31 178278 still in production?
- Discontinued.
- What is the Rolex Datejust 31 178278 made of?
- The case is 18k yellow gold. Bracelet or strap: President.
Catalog facts checked October 2026.