Small, hard gemstones used in certain moving parts of some mechanical watches. They are used in sensitive parts of the machinery because they are smooth and very durable, helping the watch stay accurate and last longer.
Synthetic sapphires or rubies that act as bearings for gears of a mechanical watch. The jewels reduce friction to make the watch more accurate and longer lasting. A quality hand wound or automatic mechanical watch contains at least 18 jewels -- many more, if the watch features complications.
Usually synthetic rubies, jewels are used as bearings for parts of watch movements that are subject to wear. Basic hand-wound mechanical watches usually have 17 jewels, while automatics often have 25 to 31 jewels (and up to 57 as in the Audemars Piguet Dynamograph).
This indicates that inside the watch, durable jewels like synthetic sapphires or rubies are used as mechanical parts because of their resistance to wear due to friction. (i.e.) "17 Jewels" engraved on the back of a watch case.
In the mechanical watch and some quartz watches, jewels (usually made from synthetic ruby) are used as bearings for those parts of the movement subject to constant motion. They are not valuable at all in the monetary sense but they are valuable in aiding the precise running of a watch over a long period and reducing wear. It is a fallacy that the more jewels the better the watch. A basic handwound mechanical usually comprises 17 jewels which in the main is the optimum count. Automatics may require more for the winding mechanism itself. In the 1960s there appeared to be a competition to see who could fit the most jewels in a watch movement, manufacturers proudly referred to 100 Jewels on the dial; opening the watch usually revealed that up to 80% of these jewels had no purpose and were simply mounted here and there on the movement to up the jewel count
Jewels are inserted in, mainly watches, to reduce friction on the gear train. Until the 20th century, watch jewels were made of ruby, sapphire, aquamarine, garnet, and diamond. I have seen colourless jewels which might be quartz, or low grade (colourless) aquamarine. Pale blue ones are aquamarine or low grade sapphire, and pink ones can be low grade ruby, or possibly garnet. Sapphire and ruby used was usually not of jewellery grade. Diamonds saw limited use, but they show up as balance wheel cap jewels periodically.
The synthetic sapphires or rubies that act as bearings for gears of a mechanical watch. These jewels tend to retain the watch's lubrication better and with far less friction than metal. A quality hand-wound or automatic mechanical watch contains at least 17 jewels. Jump Hour: An indicator on the dial that takes place of the hour hand. It usually shows the hours by means of a numeral in a window.
are elements used in mechanical watches. Usually a very inexpensive form of synthetic ruby, these are used for virtually frictionless pivots or hubs at certain critical places int the watch mechanism. These jewels are worth only pennies and do not add any monetary value to a watch. It is also important to understand that more jewels does not necessarily make a better watch. While too few can certainly be a problem, the exact number needed for optimal performance depends on the specific design and features of the movement. Overall, 17 jewels is the lowest number needed for most standard mechanical watch movements. Others movements that implement different designs, or complications such a chronographs, may use more. But a novice cannot derive useful basis of evaluation or comparison from whether a watch has 17, 21, 25 or more jewels.
the rubies or sapphires grown synthetically that used being used as bearings to reduce friction between watch movement elements. Some of them have capacity to retain lubricants by capillary action. The number of jewels varies depending on the complexity of the movement. The more complicated movements require larger number of jewels.
Synthetic rubies or sapphires used as bearings to reduce friction between watch parts. They also have the capacity to retain lubricants by capillary action, releasing them little by little. Many watches have 17 of them, though the number can go up to more than 60 on collector masterpieces.
The bearing, endstone or pallet used for reducing friction within the movement of a watch are made of synthetic material of precious or semi-precious stones. Usually a very inexpensive form of synthetic ruby, these are used for virtually frictionless pivots or hubs at certain critical places in the watch mechanism. These jewels do not add any monetary value to a watch. It is also important to understand that more jewels does not necessarily make a better watch.
Bearings that are usually made of synthetic sapphires or rubies in a mechanical watch. The jewels reduce friction and make the watch more accurate and longer lasting. These jewels do not add any monetary value to a watch.
Glass generally pressed into shapes while molten. Can have multiple faceted sides. They also can be faceted after forming through repeated machine grinding. They are used as a decorative addition to many designs.