Short answer
A fake Cartier yellow gold watch copies the case shape, dial and markings of a Cartier model but was not made by Cartier. The difference that matters most is the metal. Genuine Cartier yellow gold watches use solid 18k gold, which is 75 percent gold mixed with copper and silver. Copies use brass, stainless steel or a thin layer of gold plating over a base metal. Solid gold has real weight, keeps the same warm tone across the whole case, and carries hallmarks that match the case material.
What separates real yellow gold from a copy
Weight
An 18k gold Cartier Tank or Santos case has heft. Plated copies feel light and often feel hollow because the caseback and lugs are thin. Comparing the watch with a known gold piece of the same size tells you a great deal before you look at anything else.
Hallmarks and caseback stamps
Cartier stamps gold cases with a purity hallmark, a maker mark and a serial number that matches the paperwork. On copies the stamping is shallow, uneven or placed in the wrong spot. Electro etched numbers look fuzzy under a loupe. Genuine marks are struck into the metal.
Colour and wear
Gold plating rubs off at the edges first: the caseback rim, the lugs, the crown and the clasp. Watch for a lighter, greyer metal showing through the yellow. Solid gold does not lose colour. It collects fine scratches and patina instead.
Dial, hands and print
Cartier dial print is crisp with even spacing. Copies often show thick or broken lettering, a crooked SWISS MADE line, or a date window that sits off centre. Blued steel hands on a copy can look painted rather than heat treated.
Movement and crown action
Winding a genuine Cartier feels smooth. The crown sets with firm clicks and the date flips at midnight. A plated copy with a cheap quartz or unbranded automatic movement feels gritty and may lose time.
Quick checks you can run in a shop
- Weigh the watch on a jeweller's scale and compare it with the published weight for that reference.
- Read the caseback hallmarks and serial number through a loupe.
- Tilt the watch under a lamp and check for colour change along the lugs and clasp edges.
- Turn the crown and note the winding resistance and the click of the date change.
- Compare the dial print with a reference photo at the same size.
- Ask for the original Cartier paperwork and match the serial number to the case.
Why copies of yellow gold models are common
Yellow gold Cartier watches carry a high price because of the metal, not the design. That gap invites copies. A plated case can look right in photos and at arm's length, which makes online listings the highest risk. Photos hide weight, and studio lighting hides plating wear.
Replica grades and what they mean
- Low grade: base metal case, printed dial, quartz movement, sold at markets and street stalls.
- Mid grade: gold plated steel case, better dial print, unbranded automatic movement.
- High grade or first copy: close case dimensions, sapphire crystal, decorated movement, plated or gold filled tone.
No grade turns plated metal into solid 18k gold. A seller who calls a copy solid gold at a low price is misrepresenting the product. The gold price alone sets a floor on any real 18k case.
Before you buy
- Decide whether you want a genuine gold watch or a lookalike, because the two carry different costs and different resale value.
- Ask the seller to state the case metal in writing.
- Request close up photos of the caseback, lugs and clasp edges.
- Pay with a method that allows a dispute if the metal is not as described.
- Have a jeweller test the metal if the listing claims solid gold.