19 Incredibly Rare Opal Gemstones

1.

Tree Fossil with opal growth rings.

2.

Boulder opal.

3.

Ethiopian Welo opal.

4.

Uncut opal.

5.

Raw opal.

6.

Raw opal.

7.

Fire opal.

8.

Opal geode.

9.

Boulder opal.

10.

Ethiopian opal geode.

11.

6000 ct largest free-form black opal in the world.

12.

Oregon Contra Luz opal.

13.

Yowah opal.

14.

Koroit nut opal.

15.

Lightning Ridge black opal.

16.

Harlequin opal.

17.

Boulder opal.

18.

Ethioptan opal.

19.

Koroit opal.