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Different types of opals require different cleaning methods. To determine what kind of opal you have, look at it from the side.What's your opal types? Doublets - Doublet opals consist of two layers, a thin slice of opal and a black backing. The slice of opal is cemented to the backing in order to enhance the color.Triplets - Similar to doublets, triplets also include a third transparent layer on the top (quartz or glass) to protect the opal and give it a rounder shape.Solid Opal - Natural solid …