(Class B) A two part assembled stone consisting of precious opal cemented to another stone; this can be opal or another stone. See also Shell Skin Doublet, Boulder Doublet. View our range of Opal Doublets.
a thin layer of colorful material, backed by a black mineral, such as basalt or obsidian
a thin slice of opal cemented usually with black glue to another material such as potch opal , chalcedony or glass