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2825 Sand Hill Rd
Menlo Park, CA, 94025

(650) 292 0612

Stephen Silver is renowned for our extraordinary ability to procure, design and handcraft the world's finest jewelry and gemstones.

The Stephen Silver Fine Jewelry Estate Collection includes some of the finest pieces from the Edwardian, Victorian, Art Deco, Art Nouveau, and Retro eras. Signed and period pieces are the company's specialty; many of which are from prestigious jewelry houses such as Cartier, Van Cleef & Arpels, Bulgari, Tiffany & Co., and Harry Winston.

The Stephen Silver Fine Jewelry Signature Collection exemplifies modern day luxury combined with old world elegance to produce true works of art. Exquisitely handcrafted in platinum and 18-karat gold, using only the very finest diamonds and colored gemstones, our Signature Collection is exceptional in quality and extraordinary in style.

Why Watch Companies Use Rubies in Watch Movements

Watches

Why Watch Companies Use Rubies in Watch Movements

Annena Sorenson

When you are buying a fine timepiece with a mechanical movement inside, the technical specifications for the caliber usually list the number of jewels. Typically, those jewels are synthetic rubies, but sometimes brands use synthetic blue sapphires, as well — for a bit of a different look. The thing is, unless the movement is visible via a transparent caseback, you don't even see those jewels. So then, why use them at all? The reason is simple and effective: using synthetic jewels in the movement as bearings actually reduces friction within the caliber and therefore gives the movement a longer life by reducing wear and tear.

Adding jewels instead of mechanical metal pieces to do the bearings' job helps ensure accuracy. It also enables the watch brand to make the movement smaller in size and in weight than it would if the parts were made of metal. Additionally, rubies can withstand temperature changes and so offer stability. However, setting these minuscule jewels into their designated spots on the movement is no easy task. In fact, seasoned watchmakers must do this job using tweezers and microscopes. In the end, though, the look is beautiful, and it is great if you get to see the rubies (or sapphires) in all their glory in the timepiece.

As noted, these jewels are synthetically developed. Most use aluminum and chromium oxide that undergo heating, fusing and crystallizing processes. These rubies are not as valuable as natural rubies. The number of rubies that are used in each watch movement varies depending on the timepiece and its complexity. Typically, a three-hands watch will have about 11 to 17 rubies in it. Generally, though, more complex calibers and more moving components will demand the use of more rubies.

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