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Pictures of Opal - Black, Fire, Boulder, Blue and Pink - Geology.c…
https://geology.com/gemstones/opal/
webWhat Is Opal? Opal is one of the world's most popular gemstones and the birthstone for the month of October. A nice precious opal can flash every …
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Opal - Wikipedia
https://en.wikipedia.org/wiki/Opal
webOpal is a hydrated amorphous form of silica (SiO 2 ·nH 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to …
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Opal History and Lore - GIA
https://www.gia.edu/opal-history-lore
webOpal is considered an October birthstone. Some people think it’s unlucky for anyone born in another month to wear an opal. But that particular superstition comes from …
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Opal Gems: Value, Price, and Jewelry Information - IGS
https://www.gemsociety.org/article/opal-jewelry-and-gemstone-information/
web(Cropped to show detail). Opal Stone Facts and Information. For thousands of years, people have mined and treasured opals. These striking stones are the …
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