Boulder Opal is one of the most valuable varieties of opal. Fine specimens of Boulder Opal are able to exhibit all of the spectral colors through its distinct play of color. Boulder Opal is found embedded into large boulders of ironstone, which is how it earned its name. Occurring as pebble rock, precious opal develops within thin veins, fissures and hollows. As opal minors attempt to remove the embedded opal from the ironstone, some of the host matrix is preserved during the process. For this reason, Boulder Opal is sometimes referred to as 'Opal in matrix'. The ironstone matrix enhances the stones durability and vibrancy of color, often increasing the desirable colors and opalescence.
16mm x 33mm
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Stock Status:(Out of Stock)
Product Code: GEM-177-1