It is often seen on watches that 17 gemstones, 19 gemstones, 2 1, 23, and 25 gemstones are above.

Many people don't understand what this means. In fact, what we are talking about here is the number of gems used in the watch movement. Generally, 17 gem is 17 diamond, that is, 17 gem. Of course, a 25-diamond gem means the movement is quite good.

Note that this 17 jewel does not refer to the diamonds outside.

Let's calculate the distribution of these gems:

Two wheels, three wheels, second wheels and escape wheels; 2 X 4 = 8 drill

Two drilling holes for the upper and lower shock absorbers of the balance wheel; 2 X 2 = 4 drills

The escapement fork and fork shoe use two drill bits respectively; 2 X 2 = 4 drills

Disc-driven drill bit; 1 drill

This is a 17 drill of standard basic movements.

Under the above standard configuration,

If you add two diamonds to the box wheel, it is 19 diamonds;

The automatic system adds four or six drills, namely 2 1 drill and 23 drill;

Add 2 diamonds to the automatic calendar system, which makes 25 diamonds. These are all functional exercises.

Its main functions are wear resistance, reducing friction coefficient and oil storage.

Parts are made of gold or titanium alloy, because the former can reduce the friction between metals, while the latter is light and strong.

Its surface yellow is indeed gold, but its content is very low, which is 14K or 18K.