The opal-bearing rock may be artistically sculpted into figurines of animals, fish, etc., with the opal representing a portion of the subject. For example, a bird may be carved from the host rock with the opal forming the resplendent colors of a wing. Cabochons are usually mounted in rings, pendants, necklaces and earrings. The most durable opal is a solid piece, free from fractures. These are actually made by gluing a thin piece of good quality opal to a base of other material to form a doublet.
Triplets consist of a thin slice of opal sandwiched between a cap of clear quartz and a base.
The most outrageous fakes are fragments of opal floating in a clear plastic cast into a cabochon shape. The manufactured opals are particularly susceptible to damage from improper care and exposure to water, soap or solvents that can attack the glue or plastic. Opals should also be stored away from heat as high temperatures can drive out the contained water, and they should be rubbed with light oil to prevent moisture loss. One of the best areas to view and buy opals is in the town of Magdalena, in the state of Jalisco, a one-hour drive north west of Guadalajara. Alternatively, use the old highway to Tepic, which is in good condition.