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Opal is recognized as the queen of all gemstones and is one of the oldest gemstones since ancient civilization. The term opal is thought to be taken from the Sanskrit Upala, which means "precious stone," and after the Greek derivative "Opallios," which means to see a change of color.
https://www.rananjayexports.com/gemstones/opal

Graceful Opal Jewelry To Look Classy.pdf