| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | opal | Australia | Opals are considered a national gemstone and are highly prized in Australian culture. | 1 |
| 2 | opal | Australia | Opal is the national gemstone and is highly valued in Australia, particularly in the jewelry industry. | 1 |
| 3 | opal | Australia | Opal is the national gemstone of Australia and is commonly used in jewelry and souvenirs. | 1 |
| 4 | opal | Australia | Considered the national gemstone; significant cultural and economic value | 1 |