This is an Agate necklace. It is stamped K18, 0.11 (see photo 4). It has been cleaned at the store, but please refrain from purchasing if you are concerned about home storage. There is no box or warranty. It will be shipped in an OPP bag, bubble wrap, and an envelope, and will be sent via post. If you would like to receive it in person, I can ship it in a Yu-Packet Plus dedicated box for an additional 300 yen. Please comment before purchasing if you would like this option. Thank you. Material: K18 (18 karat gold)