Specifications: • Material: 18 kt yellow gold (750) • Total weight: 2.11 g • Opal dimensions: approx. 15 × 13 mm • Estimated opal weight: approx. 5ct • Condition: very good. It is a natural Australian solid opal with a light body tone and a lively multi-colour play-of-colour including orange/red, green and blue. good to very good, with stable appearance and no visible cracks..