The W4BB0023 is the most wearable diamond watch Cartier makes: a 33mm steel Ballon Bleu whose bezel carries 50 brilliant-cut diamonds totaling 0.58 carats, set around a clean silver guilloché dial with Roman numerals and blued sword-shaped hands. Automatic movement, blue cabochon in the fluted crown, and Cartier's interchangeable steel bracelet from the factory. Diamonds where they sparkle, calm everywhere else – which makes this a reference that truly comes alive with the right strap. Here's the correct strap size for the W4BB0023 and the options that suit it best.
Which Strap Size Fits the W4BB0023?
The Ballon Bleu W4BB0023 takes a 16mm strap. On our product pages, simply select the 16mm / 8mm option – that is the correct fit for the 33mm case.
The diamonds don't change the fit, but the case shape does: like every Ballon Bleu, the W4BB0023 is fully rounded with lugs that curve along with it, so an ordinary straight strap never sits properly. Our straps for the Ballon Bleu are shaped for this case, following its curve so the strap sits flush at the lugs without gaps.
The interchangeable bracelet is no obstacle either. The lugs accept a classic two-piece strap, and every Helvetus strap comes with its own buckle included, so nothing from the bracelet is needed – and swapping back for a special evening takes about a minute.
A Quick Look at the W4BB0023
Since 2007, the Ballon Bleu has been Cartier's modern icon – the convex case, the crown tucked under its arched guard, the blue cabochon floating like a balloon at three o'clock. The W4BB0023 adds diamonds in the smartest way possible: only on the bezel. Fifty stones circle the dial in a ring of light, while the dial itself stays a pure, uncluttered silver guilloché. The result is a diamond watch that doesn't shout – it glows.
That restraint is exactly why so many owners choose this reference as their first diamond Cartier. And it's also why a strap makes such a difference here. On the steel bracelet, the W4BB0023 is a full-metal piece with diamonds on top – beautiful, but firmly in occasion territory for many wardrobes. On leather, the metal quiets down, the diamonds become the single point of brilliance, and the watch suddenly works on an ordinary Wednesday just as well as at a wedding.
There's a protective logic too. A watch like this tends to be treasured, and polished steel links are the first thing to collect fine scratches in daily wear. Wearing the W4BB0023 on a strap keeps the bracelet in untouched condition for the moments that call for it.
The Best Straps for the Cartier Ballon Bleu W4BB0023
With diamonds above and a silver dial below, the strap's job is to set the mood. These are the combinations that work best on this reference.
1. White Leather – Let the Diamonds Lead
The white leather strap for the Cartier Ballon Bleu is the diamond wearer's classic, and a favorite choice among customers with diamond-set models. White carries the brilliance of the bezel and the light of the silver dial down onto the wrist, so the whole watch reads as one luminous piece. Fresh in daylight, radiant in the evening – if you add one strap for the W4BB0023, make it this one.
2. Pink Leather – The Everyday Softener
The pink leather strap takes the coolness out of steel and diamonds and replaces it with warmth. The blush tone suits the 33mm case perfectly and turns the watch into an easy daily companion – still precious, just more personal. The pick for owners who want to wear their diamonds casually.
3. Black Crocodile – The Evening Formula
Diamonds over black crocodile has been the dress code of fine jewelry for a century. The black crocodile strap gives the bezel maximum contrast to sparkle against, and the structured texture matches the formality of the stones. Dinners, events, black tie – this is the strap that dresses the W4BB0023 all the way up.
4. Red Leather – The Confident One
If any color belongs next to Cartier diamonds, it's the red the maison made famous. The red leather strap turns the understated W4BB0023 into a statement – rich red below, white brilliance above. Bold, joyful, and unmistakably Cartier in spirit.
Want more options? The full strap collection for the Cartier Ballon Bleu also includes blue, brown, and further choices – all available in the same 16mm / 8mm fit for this reference.
Final Thoughts
The W4BB0023 was designed to be the diamond watch you actually wear – and the strap is what makes that promise real. One look for the office, one for the evening, and the bracelet stays flawless in between.
Helvetus is one of the leading names in aftermarket straps for luxury watches, and our Ballon Bleu straps are made specifically for this case shape rather than adapted to it. Every order ships free worldwide with no import costs, returns are easy, and more than 50,000 watch owners around the world trust our straps on their timepieces. Fifty diamonds deserve more than one setting – give your W4BB0023 its second look.
