A boulder, opal signet ring & white opal signet ring, the boulder opal set in stamped 14ct yellow gold, presented as a classic, square shaped flat topped signet ring, featuring a polished piece of boulder, opal, slightly irregular in surface, striated blue throughout in colour with light aqua green striations, merging to smooth wide shoulders, the second set, in 9ct yellow gold, featuring a flat topped polished piece of white opal, green and orange in spectral colours, raised, merging to tapering ribbed, shoulders.