The closest match to a genuine Ballon Bleu medium is a 36 mm replica with a Swiss-based automatic (ETA 2892 or Sellita SW300), a faceted synthetic spinel cabochon, and a fluted crown guard that sits flush against the case. That build wins because the Ballon Bleu is a shape watch: the curved case, the guard at 3 o'clock, and the blue crown stone carry the whole design. Judge any fake Ballon Bleu medium on five points: case diameter and thickness, cabochon material, dial print and guilloché, movement, and bracelet or strap hardware.

What Medium Means on a Ballon Bleu

Cartier sells the Ballon Bleu in several sizes, and the 36 mm case is the one most people call medium. Some sellers label a 33 mm case as medium because it suits smaller wrists, and a few listings use the word for anything from 33 mm to 37 mm. Before you compare anything else, confirm the number.

  • Pro: a 36 mm case reads as the standard unisex Ballon Bleu and has the widest replica supply.
  • Pro: 36 mm keeps the dial proportions that make the Roman numerals and guilloché look correct.
  • Con: 33 mm listings labeled medium sit much smaller on a wrist and change the feel of the watch.
  • Con: some 36 mm fakes are noticeably thicker than the original profile, which shows in a side view.

Best for: anyone who wants the recognizable Ballon Bleu look on an average wrist. Ask for the exact millimeter figure in writing.

Tier 1: Entry Fake Ballon Bleu Medium

This is the quartz or basic automatic tier sold at the lowest prices. The case shape is approximated rather than copied, and the crown guard is often cast as one piece with soft edges.

  • Pro: cheapest way to test whether you like the design.
  • Pro: simple movements are easy to replace or ignore.
  • Con: cabochon is usually dyed plastic or flat glass with no depth.
  • Con: dial print is heavy, the guilloché is stamped rather than cut, and the date font is wrong.
  • Con: bracelet links rattle and the clasp engraving is shallow.

Best for: costume use, a photo prop, or a watch you will not wear near water or a gym.

Tier 2: Mid Range Ballon Bleu Medium Replica

Mid tier builds use a Japanese automatic such as a Miyota, or a cloned ETA 2824. Case finishing improves, and the watch gains a sweeping seconds hand that a quartz version cannot fake.

  • Pro: correct 36 mm diameter and closer case thickness.
  • Pro: guilloché texture and Roman numeral print look clean at conversation distance.
  • Pro: movement is serviceable and parts are common.
  • Con: cabochon is often glass and can look cloudy next to a real spinel.
  • Con: crown guard profile is slightly soft, and bracelet end links may not sit tight.

Best for: daily desk wear where the watch is seen but rarely handled. This tier is the value point for most buyers.

Tier 3: Swiss Movement Ballon Bleu Medium (Top Pick)

The top tier pairs a Swiss-based automatic with a case built to the original profile. On these, the cabochon is a faceted synthetic stone set in a polished guard, the dial guilloché is cut, and the bracelet uses a hidden butterfly clasp.

  • Pro: closest visual and tactile match, including case curve and lug angle.
  • Pro: correct hand shape, thin bezel, and proper print weight on the Cartier signature.
  • Pro: Swiss movement holds time well and can be serviced by a local watchmaker.
  • Con: highest cost of the three tiers, and the gap over mid tier is real money.
  • Con: still not a genuine watch, so resale and authentication outcomes are limited.

Best for: buyers who want the closest match and will wear the watch with short sleeves. If people will handle it, this is the tier that survives inspection.

Checklist: Spotting a Bad Fake Ballon Bleu Medium

  1. Look at the cabochon first. A real stone has depth and a bright edge; plastic looks flat and dull under indoor light.
  2. Check the crown guard. It should flow from the case with straight fluting; a fake often shows a seam or a crooked line.
  3. Read the dial print. Roman numerals should have sharp serifs and even weight, and the Cartier signature should not look bold or smeared.
  4. Inspect the hands. Sword hands should be polished with clean edges and no burrs.
  5. Turn the watch over. Caseback engraving should be crisp, with a reference number, a serial, and a Swiss Made marking that line up.
  6. Flex the bracelet. Links should move without rattle, and the clasp should close with one firm click.
  7. Weigh it in hand. A 36 mm steel Ballon Bleu feels dense for its size; light fakes feel hollow.
  8. Check the crystal. A sapphire crystal shows almost no edge distortion; mineral glass shows more.

Best for: inspecting a watch you already own or one you are shown in person. Bring a loupe if the seller allows it.

Sizing: 33 mm vs 36 mm

  • Pro of 33 mm: fits wrists under about 6.5 inches and reads as a dress watch.
  • Pro of 36 mm: keeps the full Ballon Bleu presence and matches the standard medium reference.
  • Con of 33 mm: fewer high tier replicas exist, so quality options shrink.
  • Con of 36 mm: can look large on a narrow wrist with a steel bracelet.

Best for: measure your wrist and pick the case that suits it rather than the label on the listing.

Legal and Practical Notes

Counterfeit watches are illegal to sell in the United States, and shipments can be seized by customs. That matters even when the watch is for personal use, because it affects shipping, payment, and returns. Buy from a seller who states the movement, the case diameter, and the cabochon material in writing, and who accepts returns if the watch does not match the description.