Short answer
A replica Ballon Bleu in yellow gold is not 18k gold. Cartier sells the Ballon Bleu in 18k yellow gold stamped 750. Counterfeit versions use gold plating, gold-filled steel, or gold-tone alloy over brass. The case carries no valid assay hallmark. The reference number does not match a Cartier record, and the movement is a generic clone, not a Cartier calibre.
What the genuine yellow gold model is
Cartier launched the Ballon Bleu de Cartier in 2007. The case is round with a domed profile. A curved crown guard holds the crown and a blue cabochon. Sizes run from 28mm to 46mm. Yellow gold covers the 33mm, 36mm, 40mm and 42mm sizes.
The case metal is 18k yellow gold, 750 parts per thousand. Inside sits a Cartier calibre, the 076 automatic or the 1847 MC. The crystal is sapphire. The cabochon is synthetic blue spinel.
Identifying Fake Ballon Bleu Yellow Gold Watches
Retail prices for 18k yellow gold models sit in the five-figure USD range. Prices track gold and model year. Confirm current pricing with Cartier.
Replica Ballon Bleu Yellow Gold Copy: A Comprehensive Guide
Case metal and hallmark checks
18k yellow gold has a density near 15.5 g/cm3. A gold-plated steel case feels light for its size. Weigh a known genuine reference against the watch in question when both are on hand.
Look for the 750 stamp, the Cartier maker mark, and an assay office mark. Stamps sit on the case back, the crown, and the buckle. Counterfeit stamps are shallow, uneven, or absent on one surface.
Plating wears at the crown, the lugs, and the case back edges. Inspect these points with a loupe. Yellow metal showing a gray or pink base is plated.
Movement and crown
Cartier calibres wind with a fine, even feel. Rotor noise is low. Clone movements, often built on ETA 2824 or 2836 patterns, produce a louder rotor and a coarser crown action.
A genuine Ballon Bleu hacks and hand-winds. Some cheap counterfeits do neither.
The cabochon is synthetic spinel in a distinct blue. Glass or plastic substitutes look flat under light and scratch with a fingernail.
Dial and case back
Cartier prints a hidden signature inside the VII numeral. On the yellow gold Ballon Bleu the word "Cartier" forms part of that Roman numeral. It is small and hard to read without magnification. Most counterfeits omit it or print it wrong.
"Swiss Made" sits at 6 o'clock below the minute track. Font weight and letter spacing stay consistent on genuine dials.
Case back engraving is deep and clean. Reference numbers and serial numbers are unique per watch. A seller who shows one stock photo of the back, or a serial number that repeats across listings, has no watch to photograph.
Price and papers
At recent gold prices, the metal in an 18k case alone carries four-figure USD value. Any solid gold Ballon Bleu priced under that number is not solid gold.
Cartier papers, box, and service records match the serial number. Counterfeit sets copy the box shape, not the print quality or the serial link.
Legal position
In the United States, trafficking in counterfeit goods is a federal crime under 18 U.S.C. § 2320. Penalties include prison terms and fines. U.S. Customs and Border Protection seizes counterfeit watches at ports. Buyers who import them can lose the item and receive a seizure notice.
Cartier holds the Ballon Bleu trademark and design rights. A watch that copies the case shape and carries the Cartier name infringes those rights.