12.20 Ct. Boulder Polished Opal TOG-1980

Boulder Opal is a unique type of precious opal where the opal is embedded within a sandstone boulder, unlike traditional ironstone boulder opals. This type of opal is known for its lighter colors, often featuring purple, blue, green, pink, or even rainbow hues. The sandstone backing is more fragile than the ironstone backing found in regular boulder opals.