Boulder Opal

Country of Origin
Australia

Australian Boulder Opal, as the name suggests, are mined from large ironstone boulders under the ground. Thin veins of precious and colorful opal forms in cracks and fissures in these boulders. The thin layer of opal in boulder opals can display any color of the spectrum in a beautiful play of color. The popularity of this type has soared since the mid-1970s. They are now in high demand and can be extremely valuable.