This is a great Gutta Percha pendant with an interesting design of grapes and floral design. Also have seen this as a Vulcanite pendant. Not sure of the difference. This opens up and has a gold colored frame over the cover to insert the special picture you care to insert. It has not been cleaned and I would leave that up to you as I am really not too familiar with this type of material. This measures 1.5" X 1.25". The O ring is made of the same material on another metal O ring. This is in very nice vintage condition.