Given that 1 carat is equal to 200 milligrams, a 2-carat diamond would weigh 400 milligrams. Since 1 gram is equal to 1000 milligrams, we can convert the weight of the diamond to grams by dividing by 1000.
\[2 \text{ carats} = 2 \times 200 \text{ mg} = 400 \text{
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