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2. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   Ternary plot of different colors of Ag–Au–Cu alloys [1]. Colored gold is the name given to any gold that has been treated using techniques to change its natural color. Pure gold is slightly reddish yellow in color, [2] but colored gold can come in a variety of different colors by alloying it with different elements.

3. Crown gold - Wikipedia

   en.wikipedia.org/wiki/Crown_gold

   Crown gold is a 22 karat (kt) gold alloy used in the crown coin introduced in England in 1526 (by Henry VIII). [1] In this alloy, the proportion of gold is 22 parts out of 24 (91.667% gold). Crown gold is appreciably less prone to wear than the softer 23 kt gold of earlier gold sovereigns — an important point for coins intended for everyday ...

4. Black Hills gold jewelry - Wikipedia

   en.wikipedia.org/wiki/Black_Hills_gold_jewelry

   Black Hills gold jewelry depicts leaves, grape clusters and vines, and is made with alloys of gold with standard yellow gold as well as green and pink gold. [ 1 ] [ 2 ] In 1980, the 8th Circuit affirmed an injunction ruling that if a manufacturer was to call its jewelry Black Hills Gold, then it must be made in the Black Hills. [ 3 ]

5. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   24-carat gold is pure (while 100% purity is very difficult to attain, 24-carat as a designation is permitted in commerce for a minimum of 99.95% purity), 18-carat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold), 12-carat gold is 12 parts gold (12 parts another metal), and so forth.

6. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   If the gold layer is 10kt fineness, the minimum weight of the plated layer on an item stamped gold-filled marks according to the Federal Trade Commission (FTC) must equal at least 1 ⁄ 20th of the total weight of the item. 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 ...

7. Jewellery - Wikipedia

   en.wikipedia.org/wiki/Jewellery

   By 1500 BC, the peoples of the Indus Valley were creating gold earrings and necklaces, bead necklaces, and metallic bangles. [ citation needed ] Before 2100 BC, prior to the period when metals were widely used, the largest jewellery trade in the Indus Valley region was the bead trade.