An opal and diamond ring the central oval opal 26.9mm x 10.4mm x 5.4mm, estimated weight 8.87ct

An opal and diamond ring the central oval opal 26.9mm x 10.4mm x 5.4mm, estimated weight 8.87ct framed by forty round brilliant cut diamonds, 0.80ct total approx, 18ct gold, hallmarked 1977. Size L/M, total weight 12.7g