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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 - Wikipedia

   en.wikipedia.org/wiki/Gold

   A 21.5k yellow gold ... Alloys with lower karat rating, typically 22k, 18k, 14k or 10k, ... and alloy formulas are manufactured to color-match yellow and white gold ...

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. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   If the gold layer is 12 kt or higher, the minimum layer of karat gold in an item stamped gold-filled marks must equal at least 1 ⁄ 20th the total weight of the item. The most common stamps found on gold-filled jewelry are 1 ⁄ 20th 12kt GF and 1 ⁄ 20th 14kt GF. Also common is 1 ⁄ 10th 10kt. These standards are for modern gold-filled items.

6. Gold (color) - Wikipedia

   en.wikipedia.org/wiki/Gold_(color)

   Golden yellow is the color halfway between amber and yellow on the RGB color wheel. It is a color that is 87.5% yellow and 12.5% red. The first recorded use of golden yellow as a color name in English was in the year 1597. [6] Golden Yellow is one of the colors of the United States Air Force, along with Ultramarine Blue. [7]

7. List of colors by shade - Wikipedia

   en.wikipedia.org/wiki/List_of_colors_by_shade

   Pink is any of a number of similar colors evoked by light, consisting predominantly of a combination of both the longest and shortest wavelengths discernible by the human eye, in the wavelength ranges of roughly 625–750 nm and 380-490 nm. v. t. e. Shades of pink. Amaranth. Amaranth pink. Baker-Miller pink. Barbie Pink.