Trying to find the mark D L

My husband bought this ring, it has coral inlay and it is very intricate. Now, Who the hell is D L???:wink:
I have found david livingston, and david chavez–but that’s it. Any help would be appreciated SO MUCH!!!

Initial hallmarks can be difficult to identify. It might help if we could see the style of work. You can attach a picture using the symbol in the reply box.