Comments for Can you help me identiy the design style and history of my 1920s white gold ring, single center diamond, that's stamped with a crown marking?
Hi there, Your ring would be called Art Deco (1920s to 1930s). If it were made earlier than 1920, between 1890ish to 1910 it would be called Art Nouveau.
I would google the details of the hallmark (example: crown with a W antique ring hallmark or trademark). You should get a few pages to sift through until you find the exact match. I would start with British hallmarks as they commonly used a crown.
Unless the ring is engraved with a name (such as the name of the designer or duchess) or a serial number (which was not common during the time it was made) or a newspaper of the duchess wearing the ring or documentation, there really is no way to determine whether or not a duchess actually owned it. You never know when it comes to hearsay, especially from a seller.