Factory-set diamonds on a steel Royal Oak occupy an interesting position — it’s the most accessible way into AP’s gem-set range without stepping into full precious metal pricing. This replica royal oak 15451ST carries diamonds around the bezel and on the dial markers, mounted in a 37 mm stainless steel case with a leather strap instead of the integrated metal bracelet. The “ZZ” in the reference confirms the diamond setting; “D011CR” identifies the strap.
Steel and Diamonds: Reading the Reference
AP’s reference system encodes material and configuration in a predictable way. “ST” means stainless steel. “ZZ” indicates diamond-set components — in this case, the bezel. “D011CR” tells you the watch ships on a leather strap rather than a bracelet. Each segment narrows down exactly what you’re looking at before you ever see the watch in person.
The diamonds are channel-set into the octagonal bezel, following the geometric lines rather than fighting them. AP keeps the stones relatively small and uniform, so they catch light without overwhelming the industrial design language that defines the Royal Oak. The contrast between polished steel, angular geometry, and round brilliant-cut stones gives the 15451 a character that sits apart from both the plain steel and full gold references. Compare it with the 15410BC in frosted white gold for a very different take on the 37 mm platform.
Leather Strap on a Royal Oak
The integrated bracelet is the Royal Oak’s signature feature, so a strap version changes the watch’s visual weight considerably. Without the metal bracelet tapering from case to clasp, the 15451ST wears lighter and sits differently on the wrist. The leather strap adds formality and reduces the sport-watch associations that the bracelet carries.
The Cal. 3120 inside is the same movement AP used across the previous-generation 41 mm range, scaled here for the 37 mm case. It runs at 21,600 vph with a 60-hour reserve — practical numbers that mean the watch keeps running through a long weekend without winding. The replica royal oak 15451ST works as either a daily piece or a dressier option depending on strap color. See more configurations in the Royal Oak collection, and review our FAQ for common questions about gem-set models.
| Reference | 15451ST.ZZ.D011CR.01 |
| Case | 37 mm · Stainless steel |
| Bezel | Octagonal · Diamond-set · 8 hexagonal screws |
| Dial | Silvered · Grande Tapisserie · Diamond markers |
| Crystal | Sapphire · AR coating |
| Caliber | 3120 · Automatic · 60h reserve |
| Strap | Leather · Large square scale pattern |
| Buckle | Stainless steel · AP folding clasp |
| Water | 50m / 5 ATM |
| Functions | Hours, Minutes, Seconds, Date |
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