A triplet opal gets its name due to having the following three components. A black backing, clear top & a crystal opal between the two. The top is generally glass or quartz and the backing a potch or resin.
The reason for the backing is that it greatly enhances the fire colour of the crystal opal. With the top providing a protective coating Opal Triplets make great Opal ring stones.
When created by a professional opal jeweller & with care not to get it wet an Opal ring made with an Opal triplet can easily last 20 odd years without needing any major polishing.
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