Very old Antique enamel n sterling silver cross

Antique enamel and sterling silver cross I forget the actual history on cross, it was always very vague and I've taken it to 2 appraisals people. It's very old, if you have any information please let me know. 30 years ago it retailed a a estate Jewelry show $800. Beautiful green enamel work with a hand made bail, There is a stamp.