Mizpah.
May you always be watched over.
This is an incredibly special piece, and a bittersweet PC release that is attached to a grand adventure and a lovely memory of friendship.

Size 5.5- 5.75, not sizable.
18k with a bloomed finish , almost 5mm wide at the band. Engraved "treu und fest" on the back of the shank which translates essentially to "loyal and fast (strong)" in German. Hallmarked for Birmingham 1875. A really unique Mizpah piece set with an approx .25+ctw OMC diamond.