What an awesome magical pattern, this boulder opal is 100% natural and totally amazing. Gorgeous twinkling BRIGHT red, green and blue in veins ‘squiggle’ all over this HUGE gem from Australia. Mixed in with the rich red ironstone and creating a magical pattern, this is a one and only, you will never find another the same. Mined in outback Queensland Australia, this genuine solid boulder opal weighs 166.50 carats and measuring 45.40mm X 23.70mm X 15.60mm thick, wouldn’t it look perfect set into a pendant or BIG ring . This is a genuine natural solid opal, not a doublet or triplet opal and it has not been dyed or treated in any way.