Ster & 14k gf ring with the letters WM combined the W has a small c over it and the M has a small o under it.???
If it woiuld help I can e-mail a photo or two to help ID the makers mark......Shot me an e-mail or send your address
An image of the mark might help as well as one of the ring.
I will see what I can tell you once I receive the images.
Fred I sent some photo's via the e-mail .
I hope these help some ..... Thanks