Short answer
On a Reine de Naples replica, diamond accuracy is about layout and setting, not carat weight. The better examples copy the factory stone count, stone diameter, and setting style around the oval bezel closely enough to pass at arm's length. The stones themselves are almost always cubic zirconia, sometimes moissanite. Under a loupe they will not fool anyone, so assume the word "diamond" in a listing means "diamond look."
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What accuracy actually measures
Breguet's Reine de Naples is an oval case, so the bezel curves in two directions at once. That compound curve is the hardest thing for a replica maker to match, and it is where cheap versions give themselves away. Look at:
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- Stone count. Different references use different counts around a similar bezel. A replica that packs 60 stones into a bezel shaped for 45 will look crowded.
- Stone diameter. Factory melee runs small, often under 1.5 mm. Oversized stones are the most common error.
- Setting style. Some references use grain or pavé work with tiny beads between stones, others read closer to a clean channel. Mixing them up is a fast tell.
- Bezel profile. Stones should sit in the curve of the case, not on a flat rim pasted to the top.
- Metal tone. Rhodium-plated steel reads slightly colder than white gold. At a distance it is close; beside a genuine piece it is not.
Where replicas usually slip
Spacing near the offset crown, which sits at 4 o'clock on most references, is where I see the worst work. The curvature tightens there and stones bunch up. Second is the bead or prong work. Thick, blobby metal around each stone makes even a good CZ look cheap. Third is the dial. The diamond surround draws the eye, but the mother-of-pearl or guilloché surface underneath has to match, or the whole watch reads wrong.
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What the stones really are
The vast majority of replicas in this band use cubic zirconia. Moissanite is a step up and shows more fire, though it also throws more color than a diamond at this size. Lab-grown diamonds turn up in high-end replicas, but they push the price into a range where the value argument gets weak. Either way, US sellers have to label simulants as simulants, and a listing that calls CZ a diamond is a problem no matter how the watch looks on the wrist.
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Checking one in person
Bring a 10x loupe. Diamonds have sharp facet edges where facets meet; CZ tends to show slightly rounded, worn-looking junctions. Turn the watch under a desk lamp and look for a straight, even line of light along the bezel. Any dip, gap, or doubled stone means the setting was done by hand without a jig. That is normal at this price, but worth knowing before you pay.
Bottom line
Judged purely on looks at conversation distance, a strong Reine de Naples replica can be convincing in the diamond work. Judged as jewelry, it is costume. Buy it for the oval silhouette and the case profile, not because anyone will mistake the stones for the real thing.