Triplet opals are more of a cost effective, enhanced crystal opal. The term triplet comes from the fact that there are three layers for a triplet opal. The top layer is an outer casing made of quartz or glass, middle layer is a crystal opal and the lower layer is a back backing made from black backing. The dark colour of the lower layer assists with making the crystal opal colour stand out. However, there is a bit of a glassy appearance which may influence the appearance of the stone. On the positive side triplets are extremely durable due to solid foundations provided by the layers encasing the crystal. Although care must be taken to ensure that the opal does not get wet, because this reduces the adhesion and may create a foggy appearance within the top layer.
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