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Carat is derived from Greek work keration the name of the carob tree which produces pods with seeds.
Once dried these seeds become black and hard. Ancient merchants then used these seeds for
weighing precious stones, diamonds and other valuables like pearls.
Carat weight was only standardized in the early 19th century officially adopting the metric carat.
One carat = 0,2 gram or 200 milligram.
Dried grains were also used. It was discovered that 4 grains equalled one seed of the carob tree.
Today the grain is not an authentic yet it is still used for reloading. A quarter carat is still referred
to as a one grainer.