These are 8" strands. Beautiful dyed opal from Africa. Many people have said that it looks like candy. A very fun stone, use it to create very fun designs!
Opal is actually a gemstone of hydrated silica.
NOTE: This is a dyed stone. Reactions may vary and may include bleeding, fading, and/or discoloration over time. This said, I have not seen any such behavior out of the pieces I personally own.