Correction for the weight of a Grain of Sand
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How heavy is 456 carats?
It's about 20,000 times as heavy as a Grain of Sand
The weight of a Grain of Sand is about 0.021 carats.
(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.021 carats. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.