19.50cts natural blue boulder opal carving smoky topaz 925 silver pendant u88116

Boulder Opal Carving

Boulder opal is one of the rarest and most expensive varieties of opal. Though it is lesser in value in comparison of black opal, but it is rare in availability. The on availability factor makes it a coveted opal. Many people are unable to distinguish between Boulder opal and opal doublet. The basic difference between the two is that the layering pattern is found naturally in boulder opal while in case of opal doublet, the layering is actually arranged. Boulder opal comes from Queensland, Australia. Well, boulder opal is an opal that has a tough backing comprising ironstone. The supporting ironstone and the presence of precious opal in it make it a valuable and expensive item. The boulder opal can be found in two forms. The first form co...