Overview The bolo tie is the official neckwear of Arizona, USA. It was also popular with the iconic 'Teddy Boys' in the UK, who referred to it as a 'shoe-string tie'. This particularly impressive one crafted in 18ct gold and boulder opal is most definitely deserving of the title of bolo tie due to the featured bulls head. Carved beautifully in blue-green boulder opal, featuring an 18ct nose ring, it is a nod to the cowboy's and cattle farms. Beautifully made and very unusual.