Antique Blackamoor Cameo

Antique Blackamoor Cameo, the hardstone cameo with figure in profile wearing an old mine-cut diamond collar and gold bead earring, the gold frame with box-set cushion and circular-cut rubies and rose-cut diamonds, lg. 1 in., joined to a later gold shank with engraved sholders, size 6 3/4. Shank with evidence of solder. Crack and loss near shoulder. Small loss near ear, possibly an earring top? A couple of diamonds in collar appear to be replacements. Figure appears to be without issues. Frame: several stones appear to be replaced. 14kt gold mount.