The Guinea is a coin that was minted in the UK between 1663 and 1814. It was the first English machine-struck Gold coin originally worth one Pound Sterling and equal to twenty Shillings. Rises in the price of Gold relative to Silver caused the value of the Guinea to increase, at times to as high as Thirty Shillings. From 1717 until 1816 its value was officially fixed at Twenty-one Shillings.
Following that, Great Britain adopted the Gold standard and Guinea became a colloquial or specialised term. The name came from the Guinea region in West Africa where much of the Gold used to make the coins originated.
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