The settings can sometimes be altered by removing or adding material to
existing prong mountings, bezels etc.
You can also fashion your own prongs or bezels by fabrication (assembling
by soldering), and then soldering those into the mounting after cutting
out the original setting.
If you are thinking of doing this yourself, it takes a little experience,
since many stones and designs require special care. My suggestion is to
find a manufacturing jeweler who can give direct advise on the particular
Tom Tietze, from California where we’ve had more rainy days than the
average Seattle season.