![]() This protects the watch in the event that the watch is dropped or gets hit by something while being worn. Cap jewels usually are used in conjunction with a pivot jewel and have a type of shock protection in place such as a spring at each end. When used in conjunction, they allow an axle to spin and when used on the balance staff they have an anti-shock assembly which has springs holding them in place for shock absorption.Ī cap jewel is a type of jewel without a hole bored into it which is used to minimize the balance staff's movement. Together with a cap jewel (see below) they create a set called a pivot bearing. It usually has a slightly rounded top or a flat bottom. Hole Jewels: A hole jewel (also known as a pierced jewel) is a type of jewel with a hole bored into it so that it can be mounted on the wheel's axle or pivots such as a cylindrical pivot or a conical pivot. The purpose of these jewels is to act as bearings to various components in the watch specifically the parts that make contact and would normally wear down easily such as the escape lever and the impulse jewel. So yes, there are actually precious gems in the movement of your watch and usually quite a few of them!īack in the day, watchmakers used natural genuine rubies to create these bearings, and more recently, they adopted the use of lab-created rubies (also known as synthetic rubies) or sapphires. These precious stones are smooth and don't allow much friction and are therefore used in order to make the movement of these metal and precious metal gears easier. Watches are no different and also use bearings and these bearings that are found in the higher-end automatic and hand-wound watches are made out of jewels. So what are watch jewels and exactly what do jewels do in a watch? Like any mechanical device, there are gears that need to move or rotate. Mechanical watches use spring-wound movements and therefore don't require a battery. Read our eye-opening look at mechanical watches and allow us to explain what the jewels in watches are for and how watchmakers use jewels in the mysterious and centuries-old craft of watchmaking.
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