Canada has released the world's largest, purest, most expensive gold coin. The coin has a face value of C$1 million. It is 53 cm (about 21 inches) across, 3 cm (about 1.2 inches) thick, and weighs in at 100 kg (about 221 lb). The coin is 99.999% pure gold, the highest purity level reached in a coin (Canada was the first country to mint a coin that was 99.99% pure).
Here's an article from Reuters, with a picture of the coin:
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