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crown gold

n. A 22-carat gold alloy, introduced in England for gold crown coin manufacture in 1526.

Wikipedia
Crown gold

Crown gold is a 22 karat (kt) gold alloy, crown coin, introduced in England in 1526 (by Henry VIII) to replace the earlier gold sovereign coins which were made from the softer 23 kt gold and which thereby had invited both deliberate filing and also non-intentional wear. The 22 kt standard has been used for British gold coins ever since this change which is 91.667% gold (or 22 parts out of 24).