I made this pendant using a glass vial pendant that I filled with opal chips from Australia. I've had these chips since the late 1970's and finally decided to do something with them! They are in mineral oil which allows them to slowly move as the pendant moves and help amplify the firey rainbow colors of the chips. CHAIN NOT INCLUDED I have a variety of chains for sale in my store in different styles and lengths. Most, but not all, chains will fit most of my beads. If you want a specific chain for a specific bead check first. Feel free to check out all the items here in my DVHdesigns Store and don't hesitate to contact me with general inquiries or about custom work that I could make and list for you. Thanks for shopping DVHdesigns!