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1. www.gia.edu › opalOpal Gemstone | Opal Stone – GIA

   www.gia.edu › opal

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   Learn about opal, the October birthstone that displays all the colors of the rainbow. Explore its formation, interaction with light, quality factors, treatments, synthetics, and more from GIA, the world's foremost authority on gems.

   • Research

     Research - Opal Gemstone | Opal Stone – GIA

   • Buyer's Guide

     Buyer's Guide - Opal Gemstone | Opal Stone – GIA

   • Opal History and Lore

     In ancient Rome, this gem symbolized love and hope. The...

   • An Introduction to Synthetic Gem Materials

     Synthetic ruby can be produced via flux growth processes...

   • Opal Description

     "The Path of Enlightenment" necklace contains 180...

   • Photos & Videos

     Photos & Videos - Opal Gemstone | Opal Stone – GIA

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3. en.wikipedia.org › wiki › OpalOpal - Wikipedia

   en.wikipedia.org › wiki › Opal

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   Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals.

4. geology.com › gemstones › opalPictures of Opal - Black, Fire, Boulder, Blue and Pink

   geology.com › gemstones › opal

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   Learn about opal, a popular and colorful gemstone with a unique play-of-color phenomenon. See pictures of different types of opal, such as precious, fire, boulder, black, and common opal, and find out where they are mined.

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     Opal Stone: Spiritual Meaning, Powers And Uses

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     Top 10 | Most Beautiful and Fascinating Opals Around the World

     Oct 16, 2021

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     950 carat uncut gem rough opal - I'm going in!

     May 16, 2022

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6. www.gemsociety.org › article › opal-jewelry-andOpal Gems: Value, Price, and Jewelry Information - IGS

   www.gemsociety.org › article › opal-jewelry-and

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   Learn about opal's unique properties, types, and history from the International Gem Society. Find out how to evaluate, care for, and enjoy opal jewelry.

7. www.gemrockauctions.com › learn › a-z-of-gemstonesOpal Stone Meaning, Uses, Properties, Value, & More | Gem ...

   www.gemrockauctions.com › learn › a-z-of-gemstones

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   Aug 11, 2021 · Opal gemstones are hydrated silica crystals that form over millions of years. Learn about opal details, including stone meanings and symbolism, history, pricing, and value.

8. www.opalauctions.com › a-z-of-opals › opal-gemstonesOpal Gemstones: History, Symbolism, Meanings & More

   www.opalauctions.com › a-z-of-opals › opal-gemstones

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   Opals are a hydrated silica gemstone seen in a stunning array of vibrant colors and patterns. Learn why no two opal gemstones are the same, and the meaning, history, and details that make them highly desired!

9. www.gia.edu › opal-history-loreOpal History and Lore - GIA

   www.gia.edu › opal-history-lore

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   Learn about the ancient and modern associations of opal, a gem that can show all colors. Discover how opal was valued for its beauty, magic, and symbolism in different cultures and times.