Rolex
Rolex Datejust 31 278384RBR
The Rolex Datejust 31 (reference 278384RBR) is a 31 mm Oystersteel and white gold watch. It runs on the automatic caliber 2236 with a 55-hour power reserve and is water resistant to 100 m.
Specifications
Case
- Reference
- 278384RBR
- Collection
- Datejust
- Case size
- 31 mm
- Case material
- Oystersteel and white gold
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 100 m
- Bracelet / strap
- Oystersteel
Dial and bezel
- Bezel
- Diamond-set
Movement
- Movement
- Automatic
- Caliber
- 2236
- Power reserve
- 55 hours
- Frequency
- 28,800 vph
- Functions
- Date
Production
- Production
- Current
Dial versions
This reference was made with these dials and finishes.
278384RBR Green
278384RBR-0021
Mint; Sunray · Diamond, Bezel, count not published
278384RBR Grey Dark grey #0010
278384RBR-0010
Dark grey; Sunray; Diamond-set · Diamond, Bezel, count not published; Diamond, Dial (indexes/hour markers), count not published
278384RBR Grey Dark grey #0019
278384RBR-0019
Dark grey; Sunray · Diamond, Bezel, count not published
278384RBR Grey Dark grey #0032
278384RBR-0032
Dark grey; Diamond-set; Large VI · Diamond, Bezel, count not published; Diamond, Dial (large VI numeral), 11 stones
278384RBR Pink
278384RBR-0023
Sunray · Diamond, Bezel, count not published
278384RBR Purple
278384RBR-0029
Aubergine; Diamond-set; Large VI · Diamond, Bezel, count not published; Diamond, Dial (large VI numeral), 11 stones
278384RBR White Mother-of-pearl
278384RBR-0007
Mother-of-pearl; Diamond-set · Diamond, Bezel, count not published; Diamond, Dial (indexes/hour markers), count not published
278384RBR White Lacquer
278384RBR-0013
Lacquer · Diamond, Bezel, count not published
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 |
|---|---|---|---|---|---|
| 278384RBR (This watch) | 31 mm | Oystersteel and white gold | — | 2236 | — |
| 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 278384RBR?
- The Rolex Datejust 31 278384RBR has a 31 mm case.
- What movement does the Rolex Datejust 31 278384RBR use?
- It uses the automatic caliber 2236, with a 55-hour power reserve.
- How water resistant is the Rolex Datejust 31 278384RBR?
- It is water resistant to 100 metres.
- Is the Rolex Datejust 31 278384RBR still in production?
- Yes, it is a current reference.
- What is the Rolex Datejust 31 278384RBR made of?
- The case is Oystersteel and white gold. Bracelet or strap: Oystersteel.
- Which dials was the Rolex Datejust 31 278384RBR made with?
- The catalog lists 5 dials: Green, Grey, Pink, Purple, White.
Catalog facts checked October 2026.