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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...

    Ancient Greek mythic-cultural cosmology depicted a decline from a golden age to a silver age followed by an Iron Age. In some variants there is a Bronze Age, an interim between the Iron Age and Silver Age. In Japan, the traditional Sho Chiku Bai (松竹梅) ranking system has a hierarchy of pine 松 (matsu), bamboo 竹 (take), and plum 梅 (ume ...

  4. Opaline glass - Wikipedia

    en.wikipedia.org/wiki/Opaline_glass

    With this particular glass objects of common use were handcrafted: vases, bowls, cups, goblets, carafes, perfume bottles, boxes, lamps. Some objects were also decorated in cold enamel, with flowers, with landscapes, with birds. Sometimes a bronze or silver support was added to the opal vase. 17th-century Venetian opaline glasses

  5. 15 Valuable American Coins and Which US States You’re Most ...

    www.aol.com/15-valuable-american-coins-us...

    1794 Flowing Hair Dollar – The first silver dollar struck by the U.S. Mint was sold for $10 million in 2013 1913 Liberty Head Nickle – 2013 was a good year for auctioned coins.

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

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

    In fact, as it gets darker around the opal, the opal appears ever more vibrant. The stone's vivid and sparkly nature is in stark contrast to Coober Pedy, Australia where it was discovered.

  7. White metal - Wikipedia

    en.wikipedia.org/wiki/White_metal

    The term is also used in the antiques trade for an item suspected of being silver, but not hallmarked. A white metal alloy may include antimony, tin, lead, cadmium, bismuth, and zinc (some of which are quite toxic). Not all of these metals are found in all white metal alloys. Metals are mixed to achieve a desired goal or need.

  8. Hoard of silver coins dating from Norman Conquest is Britain ...

    www.aol.com/news/hoard-silver-coins-dating...

    A hoard of Norman-era silver coins unearthed five years ago in southwestern England has become Britain’s most valuable treasure find ever, after it was bought for £4.3 million ($5.6 million) by ...

  9. Conservation and restoration of silver objects - Wikipedia

    en.wikipedia.org/wiki/Conservation_and...

    Whether silver plating or pure silver, the composite of the metal will tarnish when exposed to air and sulfur. Tarnish is a chemical reaction on the surface of metal (copper, brass, silver, etc.) and causes a layer of corrosion. In the case of silver tarnish, the silver combines with sulfur and forms silver sulfide (Ag 2 S), which is

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