Short answer
A fake Cartier Panthère bracelet is a counterfeit open cuff that copies the two panther heads, the gold tone, and the box, but fails on four things: metal content, hallmarks, engraving depth, and weight. Genuine pieces are solid 18k gold (750) and carry French assay marks plus a Cartier signature and serial number. Most fakes are hollow, plated brass or steel, or a light gold alloy struck with copied stamps. A 10x loupe and a gram scale separate the two in about a minute, and only an XRF analyzer or an acid test proves the metal for certain.
What the genuine bracelet is made of
Cartier builds the Panthère de Cartier cuff in 18k yellow, rose, or white gold. That works out to 750 parts per thousand gold, stamped as 750 or Au750 somewhere on the piece. Because 18k gold is dense, a real cuff in this style has honest heft for its size. Fakes get their color from plating over a base metal, so the same silhouette weighs far less on the same scale.
Hallmarks and engraving
Look inside the cuff with a loupe. Four marks matter.
- Cartier signature: crisp script with even depth, not a shallow laser burn
- Metal stamp: 750 or Au750, sometimes alongside the maker's mark
- Serial number: unique to that piece and matching the paperwork
- Assay mark: the French eagle head for 18k gold, or another national assay stamp depending on where it was retailed
Counterfeits often get the font slightly wrong, stamp too deep, or place marks where a real workshop never would. Copies of the stamps exist, so a clean hallmark is a good sign but not proof of anything.
The panther heads
This is where most counterfeits fall apart. On a genuine bracelet the eyes are set stones with sharp facets and matched saturation, the muzzle is polished to a clean line, and the spotted texture is carved into the metal. Fakes show soft edges, cloudy or glued stones, and spotting that reads flat, painted, or laser-etched. Run a fingernail across the spots. Real engraving has depth you can feel.
Weight, feel, and the hinge
An 18k cuff feels cold and dense, and it settles on the wrist without rattling. Plated brass warms up fast and sounds thin when tapped. The hinge on a genuine piece opens with resistance and closes flush. A fake usually shows visible gaps, a loose pin, or a hinge that wobbles side to side.
Why jewelry fakes differ from watch fakes
With watches, a so-called super clone can copy a movement, a dial, and a case to a startling degree. Jewelry is harder to fake well because the value sits in the metal itself. You cannot clone the density of 18k gold or the cost of a matched set of emeralds. That is why most Panthère counterfeits get caught by weight and stone quality before anyone bothers checking a serial number.
What actually settles it
Take the bracelet to a jeweler, a pawn shop, or an appraiser who has an XRF gun. The test takes seconds, it is non-destructive, and it reports the exact metal composition. An acid test works too, though it leaves a small mark. A Cartier boutique will clean and service genuine pieces but typically will not issue a written authentication, so a third-party appraisal is the document that matters for insurance or resale.
Buying and legal notes
In the United States, trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320, and online marketplaces pull listings when rights holders complain. Customs can seize imported fakes and destroy them. If a seller offers a 1:1 Panthère bracelet at a fraction of gold value, the safe assumption is that it is not gold. Ask for an appraisal, pay with a method that allows a chargeback, and walk away from anyone who refuses an inspection.