This absolutely stunning top gem Lightning Ridge Semi-Black Opal is quite a piece.  It weighs a very large 28.13ct and measures 30.7 x 17.7 x 6.8mm.  The body tone of this opal is a semi-black crystal.  The fire is exquisite.  There is a blueish green rolling flash across the top.  Just below that is a very beautiful bright green and blue pinfire and flashfire pattern.  Below that is a red, orange, yellow pinfire sitting on the semi-black base.  The back of the stone is flat and ready to be set into a magnificent pendant.  This stone is a true gem, which does not come around often.  Do not miss out on the opportunity to own an opal like this.