What Is a Watch Jewel and Why Does It Have Rubies?
作者: Funny Items
发布时间: 2026-08-20 07:55:50
查看数: 69
The Sparkle Inside
Watch jewels are tiny synthetic rubies or sapphires used as bearings in mechanical watches.
Why Rubies?
- Hardness 9 on Mohs scale resists wear
- Smooth surface low friction for gear pivots
- Non-magnetic does not affect timekeeping
How Many Jewels?
| Movement | Jewels |
|---|---|
| NH35 | 23 |
| NH34 | 24 |
More Jewels = Better?
Not necessarily. The number of jewels depends on the movement complexity. 21-25 jewels is standard for quality automatic movements.