An opal cluster ring set in hallmarked 18ct gold and three other hallmarked gold and gemset rings - sapphire, opal and garnet,

Condition Report
Opal cluster ring hallmarked 18ct London 1975, finger size N, all stones secure, hairline crack to the opal.
Sapphire cluster ring hallmarked 9ct Birmingham 1975, finger size N, all stones secure.
Garnet and opal ring, 9ct hallmarked London 1975, finger size M, all stones secure.
Garnet cluster ring, 9ct hallmarked Birmingham 1967, misshaped shank, all stones secure