It's a necklace. I don't know the name of the stone. It's almost unused. The chain is silver. The length is 37-41cm. It has been stored at home for a long time. Please consider purchasing after understanding that it is a used item that has been in someone's possession and stored at home. Inspection and measurements are done by an amateur. If you have any questions, please comment. I will add more images if needed. For a smooth transaction, please make your purchase after you are satisfied. It will be wrapped in bubble wrap and shipped via Yu-Packet Post Mini. 20250410