Short answer
A fake Cartier Ruban 34mm is a copy of a Cartier Libre jewelry watch. Cartier builds the Ruban in 18k gold with diamonds and a case shaped like a folded ribbon. A replica copies the outline. It does not copy the metal, the stone setting, or the movement. Cartier will not service a watch it did not make, so a replica has no factory support.
What the Ruban is
Ruban is French for ribbon. The Cartier Libre Ruban case reads as a band of metal looped over the wrist. Cartier sells the line in white gold or rose gold, set with round diamonds. The dial is small and often paved. The crystal is sapphire. Production is small, so retail records are thin. Cartier.com holds the specification when a piece is in stock.
The 34mm figure is a listing label used for this reference size. Treat it as a seller measurement, not a Cartier number, until a Cartier document confirms it.
What a replica reproduces
- Outer case shape and lug line, cast from a mold.
- Dial print, stamped or transferred.
- Crystal, mineral glass or sapphire-coated glass.
- Strap or bracelet, leather or gold-plated steel.
What a replica does not reproduce
- 18k gold. Most replicas use brass, steel, or plating. Plating wears at the case edges and the crown.
- Diamonds. Replicas use cubic zirconia, glass, or moissanite. A jeweler settles the question in seconds.
- Cartier hallmarks and serial numbers. Stamps on replicas are shallow and laser-etched.
- Weight. An 18k gold Ruban is heavy in the hand. A plated copy is light.
- Service. No Cartier parts, no Cartier repair.
Points to check on any example
- Hallmark. Look for the eagle head and the Cartier maker mark on the caseback. Use a loupe.
- Weight in grams. Ask the seller for a scale photo.
- Stone test. A refractometer or thermal tester separates diamond from simulant.
- Movement. Ask for a video of the balance wheel, or open the caseback.
- Papers. Cartier delivers a certificate with a serial that matches the case.
Price signals
Replica listings for this case shape sit in the tens to low hundreds of dollars. The gold value alone on an 18k Ruban runs into four figures. A 34mm Ruban at a low price is a replica. No exception exists. A seller who claims solid gold at a replica price is making a false claim.
Unknowns
Cartier does not publish production counts for the Libre collection. Resale prices move with diamond count and metal. Check an auction record or ask the seller for the exact reference before you pay.