12.81 Ct top gem boulder opal

12.81 carats

Natural solid boulder opal

Yaraka mining region, Queensland, Australia

Length: 28.7 mm
Width: 9.7 mm
Depth: 5.9 mm

Opal ID 3152 is a Top gem Grade boulder opal.

Australian boulder opals of this grade are extremely rare. They score very high in most valuation factors, including, brilliance, colour, pattern and play-of-colour. They often also have a black or very dark body tone.