A striking abstract boulder open and diamond drop necklace, 14ct yellow gold, of artisan style with drop form, featuring a series of seven Baroque polished panels of solid boulder opal, strong blue and green in spectral colour, graduated in size, dropping to a feature large 'Pendant' of matched tone, each panel bezel set in an open backed mount, the heavy piece spaced by brilliant cut diamonds rails between each panel, completed by a simple gold chain to reverse. Opals approximately 115cts diamonds: 3.20ct.