Black opals from Lightning Ridge are particularly prised for their play-of-color and rarity, which are sometimes priced at over $10,000 per carat.

The Lightning Ridge Opal and Gem Festival is a four day event that includes the Opal Queen Ball, Opal and Gem Expo, IOJDAA Trade Show, and IOJDAA Jewellery Competition which is held biannually. The ...