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If a .03 carat stone is about 2mm in diameter, and appears to be about the size of the letter 'o' on a typewriter, then a 1mm stone is about half that size

It doesn't work like that I am afraid. A 1mm diamond is approx 0.5 points or 0.005 carats. Commonly known as a diamond chip.

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11y ago
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Q: How many carats is a 1 mm dia?
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