This stunning pendant features a 50 ct free-form boulder opal from the Koroit Nut mine in Australia.. The pendant is not vintage and has not been treated. It comes from Australia, where it was also manufactured. This unique piece of jewelry would make a great addition to any collection and is sure to catch the eye of anyone who sees it. Size and weight in grams is shown in the photos. Set in stainless steel #925. Message me with any questions