【Retro】Boulder Opal Gold-Colored Tie Clip This item was found while organizing a storage space. I purchased it during a trip to Australia some time ago. Boulder opal is a type of opal found in Queensland, Australia, where opal is embedded in a matrix such as ironstone. It is characterized by its beautiful, unique patterns and play-of-color effect. The entire piece is gold-plated. It is in excellent condition with almost no damage, but please understand that it is a pre-owned item due to being stored at home. Immediate purchase is welcome. Please feel free to ask any questions in the comments section.