Reference: Fataawa ash-Shaykh al-‘Allaamah Muhammad Naasiruddeen al-Albaanee fil-Madeenah wal-Imaaraat – Page 148
Question: Is it permissible to wear a watch with some gemstones on it?
Response: [Allaah] the Legislator has not prohibited [the wearing of] expensive metals other than gold and silver; So there is no harm in wearing a watch which has some gemstones on it.