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  2. Electrum - Wikipedia

    en.wikipedia.org/wiki/Electrum

    Natural electrum "wires" on quartz, historic specimen from the old Smuggler-Union Mine, Telluride, Colorado, USA The Pactolus river, from which Lydia obtained electrum for its early coinage Electrum Phoenician bowl with mythological scenes, a sphinx frieze and the repre­sentation of a king vanquishing his enemies, Cypro-Archaic I, from Idalion, 8th–7th centuries BC (Louvre, Paris) Brooch ...

  3. List of gold nuggets by size - Wikipedia

    en.wikipedia.org/wiki/List_of_gold_nuggets_by_size

    Nuggets are usually 20.5 to 22 karat (k) purity, meaning they are 83% to 92% gold by mass. Gold nuggets in Australia are often 23 k or slightly higher, while Alaskan nuggets are usually at the lower end of the spectrum. Purity can be roughly assessed by nugget color: the richer and deeper the orange-yellow, the higher the gold content.

  4. Smoky quartz - Wikipedia

    en.wikipedia.org/wiki/Smoky_quartz

    Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. [6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within the ...

  5. Gold nugget - Wikipedia

    en.wikipedia.org/wiki/Gold_nugget

    A large gold nugget from Nevada County, California, on display at the National Museum of Natural History in Washington, D.C. Nuggets are gold fragments weathered out of an original lode. [1] They often show signs of abrasive polishing by stream action, and sometimes still contain inclusions of quartz or other lode matrix material.

  6. Gold parting - Wikipedia

    en.wikipedia.org/wiki/Gold_parting

    With the karat gold this low (6K), and over medium high heat, the dilute nitric acid will dissolve the Sterling silver (and other base metals in the karat gold) starting on the outside surface of the 6K gold alloy, working its way into the gold alloy, forming a honeycomb structure as it works its way into the metals.

  7. How to Sell Gold Jewelry When Prices Hit Historic High

    www.aol.com/sell-gold-jewelry-price-nears...

    For example, your 12-karat gold band is 50% gold. An 18-karat gold band would be 75% gold. Don’t confuse carat with karat. A carat is a unit of measure for a gemstone, usually a diamond. So, you ...

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