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  2. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    A Peruvian opal (also called blue opal) is a semi-opaque to opaque blue-green stone found in Peru, which is often cut to include the matrix in the more opaque stones. It does not display a play of color. Blue opal also comes from Oregon and Idaho in the Owyhee region, as well as from Nevada around the Virgin Valley. [17] Opal is also formed by ...

  3. List of individual gemstones - Wikipedia

    en.wikipedia.org/wiki/List_of_individual_gemstones

    Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal; Flame Queen Opal; Galaxy Opal; Halley's Comet Opal, the world's largest uncut black opal; Olympic Australis Opal, reported to be the largest and most valuable gem opal ever found

  4. Galaxy Opal - Wikipedia

    en.wikipedia.org/wiki/Galaxy_Opal

    The Galaxy Opal is the world's largest polished opal, certified by the Guinness Book of World Records in 1992. [1] It was found at the Boi Morto Mine in Brazil in 1976. [ 2 ] The finished opal weighs approximately 3,749 carats , or 0.75 kg.

  5. World's most expensive opal literally glows in the dark - AOL

    www.aol.com/news/2015-08-13-world-s-most...

    Meet the "Virgin Rainbow" – perhaps the finest and certainly the most expensive opal on record. It literally glows in the dark. In fact, as it gets darker around the opal, the opal appears ...

  6. Ammolite - Wikipedia

    en.wikipedia.org/wiki/Ammolite

    Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America.It is commonly unearthed by natural erosion or through the process of various mining practices, within the perimeter of an ancient sea bed called the Western Interior Seaway. [2]

  7. Rare cache of pink diamonds formed when a supercontinent ...

    www.aol.com/research-may-offer-clue-search...

    Pink diamonds are extremely rare and coveted — a now-closed mine in Australia has been the source of 90% of the colored gemstones. Polished pink specimens of the highest grade can sell for tens ...

  8. Photonic crystal - Wikipedia

    en.wikipedia.org/wiki/Photonic_crystal

    The opal in this bracelet contains a natural periodic microstructure responsible for its iridescent color. It is essentially a natural photonic crystal. Wings of some butterflies contain photonic crystals. [1] [2] A photonic crystal is an optical nanostructure in which the refractive index changes periodically.

  9. ‘Extremely rare and special’ pink creature found in South ...

    www.aol.com/extremely-rare-special-pink-creature...

    The “extremely rare” African elephant was “bathing in the mighty Olifants river” in Kruger National Park, Theo Potgieter, a guide and safari operator, said in a Feb. 13 Facebook post.