Margaret Barnaby's boulder opal bracelet centers a blue-green opal with flashes of deep red fire between two 18K gold repoussé forms. Barnaby's inspiration for her jewelry is nature, from dragonfly wings to leaves to seaforms-- which she abstracts and renders in finely hammered and chases 18K gold and sterling silver, as in this fine cuff, 1-3/8" at the widest.