What jewels are and why they are there
A watch jewel is a synthetic ruby — lab-grown corundum, the same mineral as sapphire — shaped into a bearing surface. It is used because corundum is extremely hard, takes a polished edge that a steel pivot can run against with very little friction, and holds its shape over decades of continuous rotation. Without jewels, the steel pivots would wear into the brass plates and the movement would seize.
There are two main shapes. A hole jewel is a ring with a polished bore that the pivot turns inside; a cap jewel is a flat disk that the end of the pivot pushes against, taking the axial load. Between them sits a tiny drop of oil — the thinnest film in the movement — which is why jewel count and lubrication are inseparable from a movement's longevity.
How many jewels, and what it means
Jewel count is often quoted as a quality signal, but it is only loosely correlated with quality. A basic three-hand automatic like the NH35 uses around 24 jewels; a chronograph may use 40 or more because each added function needs its own gear train and bearings. A movement can have many jewels and still be unremarkable, or few and be excellent.
What matters is that every pivot that needs one has one. A movement with 'jeweled bearings throughout' means the designer placed jewels at every high-wear point rather than economizing. That is the real statement behind the number.
The escapement: where energy becomes time
The escapement is the mechanism that releases the mainspring's stored energy in equal, counted steps. It has two jobs: to lock and unlock the gear train at precise intervals, and to give the balance wheel a small push — the impulse — on each swing to keep it oscillating. Every tick you hear is one cycle of lock, unlock, impulse, lock.
The Swiss lever escapement is the design behind almost every mechanical movement made today. A pallet fork rocks back and forth between the escape wheel and the balance, alternately locking a tooth and passing an impulse. It is simple, robust, and serviceable, which is why it has dominated for over a century. Its weakness is sliding friction: the escape wheel teeth slide across the pallet stones, which is where lubrication matters most and where wear eventually appears.
The co-axial escapement
The co-axial escapement, invented by George Daniels and adopted by Omega, addresses the lever's sliding-friction problem. By stacking two escape wheels on a single axis, it delivers the impulse through rolling contact rather than sliding, dramatically reducing the friction at the most critical interface. Less friction means less wear, less oil dependence, and longer service intervals.
It is mechanically more complex and harder to service, which is why it has not displaced the lever. But it is a genuine engineering advance, not a marketing term, and it is one of the few escapement innovations to reach production in the modern era.
Beat rate and what it changes
Beat rate — the frequency at which the balance oscillates — is measured in vibrations per hour (vph), sometimes called beats per hour (bph). Common rates are 18,000 (2.5 Hz), 21,600 (3 Hz), 28,800 (4 Hz), and 36,000 (5 Hz). A higher beat divides each second into smaller steps, which gives a smoother sweep to the seconds hand and, in principle, more resolution for regulation.
The trade-off is wear and power. A faster balance needs a stronger mainspring to keep it moving, which loads the gear train harder, and it consumes the power reserve faster. The 36,000 vph movements of the 1960s were celebrated for accuracy but notorious for service; modern high-beat calibers have largely solved this with better lubricants and materials. For most wear, 21,600 or 28,800 is the practical sweet spot — smooth enough to read as a sweep, robust enough to last.