345ct Rainbow Matrix Opal from Andamooka, Australia. This bi-colour/multicolour rough opal is heat treated to enhance its natural beauty. With rough rub shape and measuring 90mm in length, 30mm in width, and 13mm in depth, this opal is perfect for lapidary projects or as a unique addition to your gemstone collection. Add a touch of Australian charm with this stunning piece of rainbow matrix opal. Shown wet to indicate what it will finish like with a clear finish. Ready to finish or cut and shape stones from this highly coloured piece.Happy to combine post on my other items.