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2. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   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. Amongst the alloys made of gold, silver, and copper, the hardest is the 18.1 K pink ...

3. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   This abbreviation is incompatible with FTC guidelines, which require clear labeling of the gold content and fineness (e.g., 1/20 14K GF). [3] Most high quality gold-filled pieces have the same appearance as high carat gold, and gold-filled items, even with daily wear, can last 10 to 30 years though the layer of gold will eventually wear off ...

4. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   For example, knowing that standard 18-karat yellow gold consists of 75% gold, 12.5% silver and the remaining 12.5% of copper (all by mass), the volume of pure gold in this alloy will be 60% since gold is much denser than the other metals used: 19.32 g/cm 3 for gold, 10.49 g/cm 3 for silver and 8.96 g/cm 3 for copper.

5. Lapis Lazuli Is Going to Be Huge This Fall—Here Are Our ...

   www.aol.com/lifestyle/lapis-lazuli-going-huge...

   Here, the prettiest lapis lazuli jewelry to buy now. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us. Sign in. Mail. 24/7 Help. For premium ...

6. 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.

7. Jewellery - Wikipedia

   en.wikipedia.org/wiki/Jewellery

   Headdress decorated with golden leaves; 2600–2400 BC; gold, lapis lazuli and carnelian; length: 38.5 centimetres (15.2 in); from the Royal Cemetery at Ur; Metropolitan Museum of Art (New York City) By approximately 5,000 years ago, jewellery-making had become a significant craft in the cities of Mesopotamia.