Rolex Day-Date 18348

A checked version of this page, approved on 9 August 2026, was based on this revision.

Day-Date -> 18348

The 18348 is the diamond-bezel Day-Date of the caliber-3155 era, the double-quickset successor to the caliber-3055 diamond 18048 and the gem-set sibling of the fluted 18238 and bark 18248. A 36mm yellow-gold President with a factory diamond-set bezel, it ran from 1988 to about 2000 on the caliber 3155, which sets both the day and the date from the crown. The diamond bezel was a common catalogue option, so the 18348 is a jewellery-grade volume President that trades on metal, condition and dial, with the special-dial examples at the top.

Core facts

detail	value
reference	18348
family	Day-Date
production	1988 to about 2000
movement	caliber 3155, 31 jewels, 28,800 vph, double quickset (day and date), ~48h, COSC
case	36mm 18k yellow gold President
crystal	sapphire
bezel	factory diamond-set
bracelet	President 8385 with hidden Crownclasp, solid links; pavé centre-link upgrade documented
lume	tritium ("T SWISS MADE T") early, Luminova then Super-LumiNova near 2000
dial	champagne and silver diamond-index, string-diamond, mother-of-pearl, Roman, pavé, serti, stone
crown	Twinlock screw-down
siblings	18238 (fluted), 18248 (bark), 18349 (white gold / Tridor), 18346 (platinum)
higher gem references	18388 / 18389 (diamond-set lugs and case, pavé dials)
predecessor	18048 (caliber-3055 diamond)
successor	118348 (6-digit, caliber 3155)

Where it sits in the line

The 18348 is the diamond-bezel member of the caliber-3155 Day-Date generation. The generation splits by finish the way the caliber-3055 references did: the 18238 is the fluted volume reference, the 18248 carries the bark, and the 18348 carries the factory diamond bezel. The 18348 and the bark 18248 sit a single digit apart and are routinely swapped in listings; the 18348 is the one carrying stones around the dial, the 18248 the one carrying worked-gold texture. Above both sit the 18388 and 18389, which take the diamonds onto the lugs and case and usually pair them with pavé dials. In white gold the diamond reference is the 18349, frequently seen as a "Tridor" with a tri-colour President bracelet, and in platinum the 18346. Behind the bezel the 18348 is an 18238, down to the case, the caliber 3155, the sapphire crystal and the President bracelet.

Production outline

The 18348 ran from 1988, when the caliber 3155 replaced the 3055 across the Day-Date line, until about 2000, when the 6-digit 118348 took over with the same movement. The diamond bezel was a standard catalogue option across the run, so the 18348 was made in reasonable numbers as the gem-set yellow-gold President of its decade. Across the run the only running change of note is the lume: early examples carry tritium, marked "T SWISS MADE T" at the foot of the dial, while the latest examples switch to Luminova and then Super-LumiNova near the 2000 handover. Nothing else moved across the twelve years: the case, the caliber and the bracelet leave the run as they entered it.

Movement notes

The 18348 runs the caliber 3155, the double-quickset Day-Date movement: 31 jewels, 28,800 vph, a roughly 48-hour reserve and COSC certification, with both the day and the date set from the crown. The double quickset is the substantive advance over the caliber-3055 18048, whose movement quicksets only the date. The 3155 is the long-serving modern Day-Date caliber, shared with the fluted 18238 and the bark 18248 and carried forward unchanged into the 6-digit 118348. The Reference:Movements page holds the caliber lineage, and the 18238 entry covers the 3155 in detail.

Dial map

The diamond bezel is the constant on the 18348; the dial is where the variety lives. The common configuration is a champagne or silvered dial with diamond hour markers, often with baguettes at six and nine. Beyond that the reference carries the full gem-set range of the period: string-diamond dials, mother-of-pearl, white and black Roman, full pavé, and serti dials that set coloured stones, emeralds, rubies or sapphires, into a diamond chapter ring. Stone dials such as the ferrite grounds of the 1990s appear as well. The deep dial taxonomy that spans the President line sits on the 1803 entry.

Case, bezel, crystal, and crown

The case is the 36mm yellow-gold Oyster shared across the caliber-3155 Day-Date, with a sapphire crystal and Cyclops, a Twinlock screw-down crown and a screw-down caseback. The defining feature is the factory diamond-set bezel, a single row of round brilliants. The stone count is not consistently documented across the reference. Gold cases and a bezel that is straightforward to set have made aftermarket diamond bezels and dials common, and that is the main authenticity question on the 18348; the call rests on the quality and proportion of the setting, and on Rolex paperwork. The diamond-set bracelet and diamond-set case upgrades that some examples carry push toward the higher 18388 and 18389 references.

Bracelets, end links, and clasps

The 18348 wears the President bracelet, reference 8385, with the concealed Crownclasp and the solid links of the 5-digit era. The gem-loaded examples add a pavé centre-link President, with diamonds set down the length of the bracelet. As with any President, a clasp date code dates the bracelet, which may be older or newer than the head, and the cross-family detail sits on Reference:Bracelets.

Special branches

Serti and special dials

On the 18348 the serti configuration usually means emerald or ruby markers on a champagne ground, set into a diamond chapter ring. Coral and other hardstone grounds, mother-of-pearl and full pavé all appear on the same diamond-bezel case.

The gem-loaded examples

The gem-loaded configuration — diamond bezel, black diamond dial and a pavé centre-link President bracelet, the examples that reach the strongest results.

The most heavily set 18348s pair the diamond bezel with a diamond dial and a pavé centre-link President bracelet. That configuration sits closest to the diamond-set-case 18388 and 18389 above it in the catalogue, and it is where the reference's strongest auction results come from.

Auction record

The 18348 is a liquid, jewellery-grade volume reference, and where it does well the gem content drives the result. Antiquorum sold a black-diamond-dial example with a pavé centre-link bracelet in New York in 2016 for USD 33,125, well over its estimate and the strongest documented result for the reference. Antiquorum has also catalogued a champagne example with an emerald-marker serti dial in Geneva, and Sotheby's a blue sunburst diamond-index example dated to about 1989. A standard yellow-gold diamond-bezel 18348 trades in the high twenties to low thirties of thousands of dollars, a clear step above the fluted 18238 for the gem content, though the result still turns on carats, condition and dial. The serti, stone and pavé dials are what reach the upper end.

date	house	configuration	result
2016	Antiquorum New York, lot 210	black diamond-index dial, diamond bezel, pavé centre-link bracelet	USD 33,125
2024	Antiquorum Geneva, lot 122	champagne diamond-Roman / emerald-marker serti dial	result not published
2025	Sotheby's Fine Watches, lot 105	blue sunburst dial, diamond-set indices, c.1989	result not published

Related references

Day-Date 18208 — 1988–2000
Day-Date 18238 — 1988–2000
Day-Date 18248 — 1988–2000
Day-Date 19018 — Oysterquartz President (1977–2001)
Day-Date 18028 — 1977–1988
Day-Date 18038 — Cal 3055 President (1977–1988)