An opal pendant is set on a beautiful platinum chain. - Materials: Opal, Diamond - Chain Material: pt850 - Design: Pendant type - Color: White - Features: Iridescent luster Thank you for viewing. I purchased this at a jewelry store exhibition a few years ago. There is no certificate of authenticity, but I purchased the opal top for 450,000 yen and the platinum chain for 35,000 yen at the time. The length is easily adjustable.