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2. 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 ...

3. File:Gold Spot Price per Gram from Jan 1971 to Jan 2012.svg

   en.wikipedia.org/wiki/File:Gold_Spot_Price_per...

   English: This chart shows the nominal price of gold along with the price in 1971 and 2011 dollars (adjusted based on the consumer price index). The historical gold price was obtained from www.igolder.com; CPI was obtained from www.rateinflation.com.

4. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   24-karat gold is pure (while 100% purity is very difficult to attain, 24-karat as a designation is permitted in commerce for a minimum of 99.95% purity), 18-karat gold is 18 parts gold, 6 parts another metal (forming an alloy with 75% gold), 12-karat gold is 12 parts gold (12 parts another metal), and so forth. [20]

5. American Buffalo (coin) - Wikipedia

   en.wikipedia.org/wiki/American_Buffalo_(coin)

   The design of the American Buffalo gold bullion coin is a modified version of James Earle Fraser's design for the Indian Head nickel (Type 1), issued in early 1913. After a raised mound of dirt below the animal on the reverse was reduced, the Type 2 variation continued to be minted for the rest of 1913 and every year until 1938, except for 1922, 1932, and 1933 when no nickels were struck.

6. Gold coin - Wikipedia

   en.wikipedia.org/wiki/Gold_coin

   Gold coins for sale at the Dubai Gold Souk. A gold coin is a coin that is made mostly or entirely of gold.Most gold coins minted since 1800 are 90–92% gold (22‑karat), while most of today's gold bullion coins are pure gold, such as the Britannia, Canadian Maple Leaf, and American Buffalo.

7. American Gold Eagle - Wikipedia

   en.wikipedia.org/wiki/American_Gold_Eagle

   The 22 kt gold alloy is an English standard traditionally referred to as "crown gold". Crown gold alloys had not been used in U.S. coins since 1834, with the gold content having dropped since 1837 to a standard of 0.900 fine for U.S. gold coins. For American Gold Eagles the gold fraction was increased again to .9167 or (22 karat).