The Rolex 278271 is the Datejust 31 in Everose Rolesor: a 31mm Oystersteel case paired with an 18k Everose gold bezel and winding crown, on a Jubilee or Oyster bracelet. If you are shopping for a replica of this reference, here is the short answer first. The 31mm case is small enough that proportion errors are visible from arm's length, and the Everose gold is the hardest part to reproduce. Most replicas get one of those right and miss the other, so decide which one you care about before you buy.

What the real 278271 gives a replica to copy

The Datejust 31 has been in the Rolex catalog for decades, which means there is a huge photo library to compare against, and that works in your favor. The real watch runs 31mm across, roughly 10.5mm thick, with 100m of water resistance and a sapphire crystal topped by a Cyclops lens over the date at 3 o'clock. Inside is Rolex calibre 2236, an automatic that beats at 28,800 vibrations per hour with about 55 hours of power reserve and a Syloxi silicon hairspring. Dials are sunray finished, and the bezel is smooth, fluted, or diamond-set depending on the configuration. Bracelets are the five-link Jubilee or the three-link Oyster.

Everose is where most replicas fall apart

Everose is Rolex's own pink gold alloy, created in 2005, and it includes platinum in the mix to keep the tone from drifting. The color is a warm, slightly coppery pink. Replica factories usually plate steel with rose gold through PVD or electroplating, and that plating reads orange or brassy the moment you get it under real daylight. It also wears through first at the crown, the clasp edges, and the underside of the bezel. Ask for photos taken outdoors, not in a light box, and look at how the metal behaves in shadow. If the tone goes yellow in low light, it is not close.

Case, crown, and crystal at 31mm

A small case forgives nothing. The lug curve, the thickness of the mid-case, and the way the bezel sits above the case flanks all need to match. On the real watch the case sides are polished while the lugs carry a brushed top surface, and that contrast should be crisp, not smeared. The winding crown is gold on a Rolesor model, with a coronet that stays sharp under magnification. Rep crowns tend to be steel with plating, and the coronet goes soft and rounded. The crystal should sit nearly flush with the bezel, and the Cyclops should magnify the date roughly 2.5 times without distorting the numbers at an angle.

Dial and bezel details worth zooming in on

Sunray dials shift tone as you rotate the watch. Flat, dead-looking dials with printed texture are an instant tell. Check the printing on the coronet and the text lines: they should be sharp enough to read the serifs at a normal viewing distance. On the date, the font matters more than most people think, and the aperture should have a clean beveled edge. A diamond-set bezel is the hardest configuration to fake well, because the setting quality shows. On the real thing the stones are uniform in size, evenly spaced, and set at the same height. On cheap replicas you will see gaps, uneven heights, and stones that look cloudy rather than bright.

The movement inside

You are not going to get a Syloxi hairspring in a replica, and no seller should tell you otherwise. What you can reasonably expect is a Japanese automatic or a decent Chinese clone running at 4 Hz. That gives you a smooth 8-beat-per-second sweep on the seconds hand, which is the thing people actually notice. Be skeptical of any listing that claims a Swiss ETA movement at a low price, and be equally skeptical of a seller who will not show you a running video with the caseback removed or at least a clear timegrapher reading.

Bracelet, clasp, and link composition

On a Rolesor Jubilee, the three center links are gold and the two outer links are steel. On a Rolesor Oyster, only the center link is gold. Replica bracelets frequently get this backwards or plate the whole bracelet, which is wrong and easy to spot once you know it. Pull the bracelet straight and check that the end links meet the case with no gaps or rattle. The clasp should close with a firm, quiet click rather than a hollow snap, and the engraving on the blade should be cut, not stamped flat. Weight is a poor test on this reference, by the way, since the real watch is mostly steel too.

Water resistance and daily wear

The real 278271 is rated to 100m and can handle swimming. A replica is not pressure tested at the factory, no matter what the caseback says. Treat it as splash resistant until a watchmaker has actually tested the seals, and even then, keep it out of hot water and steam, which will attack the plating on the crown and bezel faster than anything else.

Quick checklist before you commit

  • 31mm case with the correct lug curve and a visible polish and brush contrast
  • Everose tone checked in daylight, not studio lighting
  • Fluted bezel with sharp, even ridges, or diamond setting with no gaps
  • Sunray dial that changes tone as it moves
  • Date font and Cyclops magnification that look natural at an angle
  • Bracelet link composition matching the bracelet type
  • Movement sweep at 8 beats per second, confirmed on video
  • Clasp engraving cut clean, not stamped

One last thing. Ask for photos of the exact unit you will receive, not catalog images. A seller who only has stock pictures is not selling you a specific watch, and on a reference this detail-heavy, that difference matters more than the price tier you pick.