Short answer
A fake Rotonde rose gold diamond is a copy of a Cartier Rotonde de Cartier watch with a rose gold tone case and a diamond-set bezel or dial. Makers copy three parts first: the round case, the Roman numeral dial, and the cabochon crown. They copy the movement, the gold purity, and the stone quality last.
What the real watch is
Cartier sells the Rotonde de Cartier as a round case watch. Rose gold models use 18k gold, alloyed with copper for the pink tone. Selected references carry brilliant-cut diamonds on the bezel. Cartier does not publish one fixed diamond count. Counts and carat totals change by reference and by production year.
Case and dial points
- Case shape: round, stepped bezel
- Case metal: 18k rose gold, stamped 750
- Crown: fluted, set with a sapphire cabochon
- Dial: silvered or guilloche, Roman numerals, blued steel hands
- Caseback: sapphire crystal on most current references
Diamond setting, real and fake
Cartier uses brilliant-cut stones. A bezel setting holds stones in metal along the edge. A fake watch may use cubic zirconia, moissanite, or low-grade diamonds. A jeweler can test a stone with a thermal or electrical tester in under a minute. Gold content needs an X-ray fluorescence test or an acid test at a bench.
What fakes get wrong
- Gold color. Plated brass and steel wear through at the lugs and crown.
- Weight. 18k rose gold is dense. A plated case feels light for its size.
- Bezel stones. Glue-set stones sit above the metal. Cartier sets stones flush.
- Dial print. Roman numerals show thick strokes and uneven spacing.
- Movement. Most fakes use a Chinese automatic or a quartz module.
Words that matter
Replica, fake, and homage are not the same. A replica copies a trademarked design and logo. An homage borrows a shape and carries its own brand name. US law treats counterfeits as illegal to import and sell. FTC Jewelry Guides require accurate gold content claims on any piece sold as gold.
Price points
Real rose gold Rotonde diamond references sell in the five-figure USD range at retail. Replica prices run from about 100 USD to 800 USD. The metal value of a genuine 18k rose gold case tops the full cost of most replicas.