(Back of the opal).

This is a large 'Thumb sized' opal from Ethiopia that I bought as a rough nodule and cut.

It's very strange in many ways.

First, the very bottom part of the opal is clear crystal opal (This was the bottom of the nodule).

Second, it has this weird ring effect in the colour pattern of the opal. It's like the undulation of cloud bottoms.

Third, it has a unique pattern of fire, kind of like a tortoise shell, with smaller patches in the centre and spreading out to larger patches.

This is a 100% natural, non-treated opal.

And fourth, this is a 'Hydrophane' opal that has almost no water content.

When left in the water for ten minutes, it will absorb the water (Non-damaging to the opal by the way) and become crystal clear, with sheets of colours.

I am not sure the carat weight. I will just say 'Big and heavy'.

Enjoy