The short answer
A fake Ladybird diamond copy is a replica of the small Rolex ladies' watch from the late 1950s, usually built with a diamond-set bezel, diamond hour markers, or both. Two things are true at the same time. The case shape and proportions get copied well these days, and the diamonds almost never are diamonds. Most pieces sold under that description carry cubic zirconia. A smaller share carry moissanite, lab-grown stones, or low-grade melee that would not pass a grading lab.
What the Ladybird actually is
Rolex used the Ladybird name for a small gold dress watch in the late 1950s, with references in the 65xx family and a case around 25 to 26 mm. It was one of the smallest watches the brand made, which is exactly why it is hard to copy. On a 26 mm case, every proportion is visible. A bezel that is half a millimeter too thick, a dial font that is slightly wide, or lugs that sit too square will read wrong on the wrist even if the whole thing looks fine in a listing photo. The line later folded into the Lady-Datejust family, so you will see the two names used loosely for the same style of watch.
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What "diamond" means in this market
In replica listings, diamond usually describes the look, not the material. Ask any seller for paperwork from a lab and the conversation changes fast. Cubic zirconia is the default. It is brighter and more dispersive than diamond, so it throws more rainbow fire in daylight, and it scuffs and goes cloudy with wear. Moissanite is a step up in hardness but it is doubly refractive, which a jeweler can see as facet doubling under a loupe. Lab-grown diamonds are real diamonds and often cost more than the watch itself, so they turn up in this market rarely.
Where a good copy shows itself
- Bezel setting. Genuine factory diamond bezels set stones in gold with even beads and even spacing. On copies you often see glue, uneven gaps, or stones that are simply too large for the bezel rim.
- Dial printing. The text should be crisp and centered. Fuzzy edges or a logo that sits too low are the first things a jeweler notices.
- Crown and caseback. The crown should be small and sit close to the case. If it stands proud or the caseback is thick, the case was not built to the original spec.
- Movement. Many copies run quartz, which you can spot by the ticking seconds hand. Automatic copies use small Chinese movements with a different winding feel and a different crown position.
Checking stones yourself
A thermal probe will separate diamond from cubic zirconia in seconds. Moissanite passes the thermal test, so you need a multifunction tester or a loupe to rule it out. None of that tells you the stone's color or clarity grade, and none of it tells you whether the setting is gold or plated brass. I would treat any verbal diamond claim in this market as unverified until a jeweler looks at it.
The part most listings leave out
A replica is a counterfeit. Selling one as a Rolex is trademark infringement and fraud, and importing one into the US can get it seized by customs. Rolex will not service it, and no authorized dealer will touch it. There is no resale market, which matters because vintage Ladybirds in gold trade at auction for less than most people assume. Do the math before paying replica money for a watch that only goes down in value.
Quick checklist
- Measure the case. It should be about 25 to 26 mm across, not 30.
- Look at the bezel setting under light from the side. Even beads, no glue.
- Run a thermal test before believing any diamond claim.
- Check the seconds hand for a tick, which means quartz.
- Assume no service and no resale, and price it that way.