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  2. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    Opal was rare and very valuable in antiquity. In Europe, it was a gem prized by royalty. [ 18 ] [ 19 ] Until the opening of vast deposits in Australia in the 19th century the only known source was Červenica beyond the Roman frontier in Slovakia . [ 20 ]

  3. Hierarchy of precious substances - Wikipedia

    en.wikipedia.org/wiki/Hierarchy_of_precious...

    The measurement of sales of popular music starts high relative to the wedding anniversary scale, concentrating on gold and platinum (see gold album).Likewise, credit card companies usually have a "gold card" and a "platinum card" (many formerly had a "silver card" then followed by a "gold card", but due to similarity in appearance between silver and platinum these were often discontinued with ...

  4. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    White gold is an alloy of gold and at least one white metal (usually nickel, silver, platinum or palladium). [4] Like yellow gold, the purity of white gold is given in karats. White gold's properties vary depending on the metals used and their proportions. A common white gold formulation consists of 90% wt. gold and 10% wt. nickel. [3] Copper ...

  5. 10 of the Most Valuable US Gold Coins

    www.aol.com/10-most-valuable-us-gold-210005622.html

    In January 2021, an example graded MS-65 became the most valuable gold coin in the world — but only for a few months — when it sold for $9.36 million at the same Heritage auction that featured ...

  6. Do NOT Do These 4 Things If You Find an Old Coin or Bill That ...

    www.aol.com/don-t-4-things-old-110036332.html

    Pearlman added that abrasive cleaning can damage coins and significantly lower their value to collectors. “A $1,000 silver dollar can suddenly become a $100 coin if a kitchen scouring pad has ...

  7. 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 ...

  8. 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

  9. Yowah nut - Wikipedia

    en.wikipedia.org/wiki/Yowah_Nut

    The Yowah opal field in the Shire of Paroo. The Yowah nut is a type of precious opal, found within the Yowah opal fields situated in Yowah, Shire of Paroo, South West Queensland, Australia since the latter part of the 19th century. [1] These opals are known for their distinctive nut-like shape, opalescent patterns, and vibrant colours.

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