Short answer
A fake Cartier Panthère gold watch has a case and bracelet made from gold plated brass, steel, or gold filled stock. A real gold Panthère uses solid 18k gold, marked 750, with an assay hallmark, a quartz Cartier caliber 157, and a sapphire crystal. Plating, weight, engravings, and movement settle most cases.
1. Test the metal
- Magnet. 18k gold is not magnetic. A steel core under gold plate pulls a magnet. Treat this as a screen, not proof.
- Weight. 18k gold has a density near 15.5 g/cm3. A small Panthère on a full bracelet in solid 18k gold often weighs 70 g to 100 g. Copies of the same size sit lower because brass and steel are lighter.
- Wear points. Plating rubs off at lug edges, clasp corners, and the sides of links. Look for gray or red base metal under the gold.
- Bench test. A jeweler with an XRF gun reads the alloy in seconds. Acid tests on a scratch mark work too. Ask for the readout in writing.
2. Read the hallmarks and engravings
Solid 18k Cartier watches carry a "750" or "18k" stamp, a maker's mark in a lozenge, and an assay office hallmark. French assay uses the eagle head for 18k gold. Swiss assay uses the Helvetia head for 18k. A gold plated copy has no assay mark, or a stamped mark with the wrong shape and depth.
The case back on a Panthère holds "Cartier", "Swiss Made", "Quartz", a reference number, and a serial number. Gold Panthère references start with the letters WGPN. Steel models start with WSPN. Fake engraving is shallow, shows laser dots, and uses letter spacing and fonts that do not match Cartier's own.
3. Check the movement, dial, and crystal
The Panthère de Cartier runs a quartz caliber 157. A copy holds a generic Swiss or Chinese quartz module with no Cartier stamp on the plate. The dial has Roman numerals, blued steel sword hands, and the secret signature worked into the VII numeral. The crown carries a blue cabochon, a synthetic spinel on real watches. The crystal is sapphire. Mineral glass and acrylic scratch and reflect light in a different way.
4. Do the gold math
18k gold is 75% gold by weight. A bracelet that holds 60 g of 18k gold contains 45 g of fine gold, or 1.45 troy ounces. At a gold price of $2,000 per troy ounce, that metal is worth about $2,900 before any work. No seller moves a solid gold Panthère below that floor. A low price on a "gold" Panthère points to plated metal.
5. Verify before you pay
- Ask for a movement photo and a case back photo with the serial visible.
- Match the serial against the papers and the box.
- Book an inspection at a Cartier boutique or an authorized service center.
- Buy with a written appraisal that lists metal content, reference, and serial.
Watches sold as first copy or replica are plated unless the listing states solid gold and shows a hallmark photo. Unknown details are common on secondhand listings. When a seller cannot show a hallmark photo or a movement photo, treat the watch as plated until a bench test says otherwise.