high grade parcel of rough crystal opal - 155 cts

* opal type: rough crystal 
* metal: nil
* colours: blue, green
* largest: 25.88 x 30.35 x 10.68 mm
* smallest:  12.33 x 16.77 x 4.09 mm
* origin: coober pedy, SA
* brightness: 7/10
* pattern: floral
* shape: rough