Diamonds are the most common jewels used on watches. They are used many times as number markers on the faces of watches. I have also seen diamonds comprise the entire face of a watch in a pave manner. Cabachon sapphires or rubies are used quite often to top off winding stems on watches.
The jewels most commonly used on watches are diamonds. Watch faces are often made of mother-of-pearl, which is the lining of mollusk shells, such as oysters or abalone.
Diamonds,Quartz, and Pearl are common.Rubies and Emeralds are uncommon in watches. For a truly custom watch visit a jeweler and have one made to your specifications, include gems you know are special to her.