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2. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   Diagram of a gold-filled object A watch made from gold-filled metal. Gold-filled is a type of composite material. Composites are formed from two or more constituent materials with different properties that, when combined, create a new material with enhanced properties. [1] Gold-filled material is made by bonding a layer of gold alloy to a base ...

3. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   834—20 karat; 750—18 karat: In Spain oro de primera ley (first law gold). 625—15 karat; 585—14 karat; 583.3—14 karat: In Spain oro de segunda ley (second law gold). 500—12 karat; 417—10 karat: Lowest legal solid gold karat made in the US prior to the August 2018 revision of the FTC Guides (Now 1 karat is legal).

4. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   18K pink gold: 75% gold, 20% copper, 5% silver; 12K red gold: 50% gold and 50% copper; Up to 15% zinc can be added to copper-rich alloys to change their color to reddish yellow or dark yellow. [2] 14K red gold, often found in the Middle East, contains 41.67% copper. The highest karat version of rose gold, also known as crown gold, is 22 karat ...

5. 'Pawn Stars:' Why a rare coin worth six figures sold for much ...

   www.aol.com/entertainment/2014-12-12-pawn-stars...

   On History Channel's hit show "Pawn Stars," a man came in to sell a 1907 Saint-Gaudens double eagle $20 gold coin. The coins are extremely rare, and some of them have sold for more than $1 million ...

6. Jewellery - Wikipedia

   en.wikipedia.org/wiki/Jewellery

   The more common form of jewellery was the hammered sheet type. Sheets of metal would be hammered to thickness and then soldered together. The inside of the two sheets would be filled with wax or another liquid to preserve the metal work. Different techniques, such as using a stamp or engraving, were then used to create motifs on the jewellery.

7. Electrum - Wikipedia

   en.wikipedia.org/wiki/Electrum

   The name is mostly applied informally to compositions between 20–80% gold and 80–20% silver, but these are strictly called gold or silver depending on the dominant element. Analysis of the composition of electrum in ancient Greek coinage dating from about 600 BC shows that the gold content was about 55.5% in the coinage issued by Phocaea .