DETAILS: No1662 Natural solid boulder opal loose stone 12.23ct set of 2
 Stone  Natural solid boulder opals 
 Carat   12.23ct (2 pieces)
 Dimensions   21.33mm x 9.64mm Thickness 3.98mm (6.11ct)
20.79mm x 8.84mm Thickness 4.63mm (6.12ct) (at the longest point )
 Shape   Freeform
 Colour   Blues
 Transparency   Opaque 
 Origin   Winton, Queensland, Australia
 Note   Last picture is back of the stones. 
   All photos were taken under natural light.
 Coin show in photo is Australian two-dollar coin.Size 20.50mm diameter.