A doublet opal is composed of a black backing glued to a thin slice of opal. Doubles are noticeable as the point of adhesion is visible from the side of the opal. In comparison to a triplet doublets are generally more expensive as they contain more opal and the appearance of the opal is more natural due to no protective layer. The dark colour of the lower layer assists with making the opal colour stand out. Additionally, doublets are reasonably durable as the bottom half of the opal is protected. However, care must be taken to ensure that the opal does not get wet, because this reduces the adhesion.
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