Opal, Australian Mintabe, Mintebe Opal, Pear Shape Cabochon , 2.52 Carats, 17 x 9 x 2.6 mm, Fine Color. This is from a location in Australia that is noted for producing some of the finest Opals ever mined. I placed a series of photos of this opal held between my fingers as I slightly rotated it in the sunlight. You can watch the beautiful play of color move across the sutface of the opal. Actually the color is not just on the surface. It actually comes from many layers of molecules from the surface down into the opal.