Special edition encased opal back with a rainbow array of 24 karat Gold &Silver fumed Millefiori root with unique hidden ultraviolet elements. Approximately 26mm diameter. The gold and silver was first fumed on a bubble and then trapped with dots of illuminati and Lucy. That were then imploded and pulled out into a Millefiori. The core or root base of the Millefiori somehow changes the red Lucy to Blue under UV light. I'm not sure how this happens but it's only present in the core or root of the Millefiori. Glass is absolutely magical and this is one of those rare moments were even after nearly 28 years on the torch I'm not sure exactly what's happening in there!