0.1181102362 in
Direct Conversion Formula 3 mm*
1 in
25.4 mm
=
0.1181102362 in
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If the diamond is an ideal emerald cut with these measurements, the diamond may weigh about one quarter of a carat. Otherwise, you have stated the diamond's 'big' size in measurements.
Twelve inches is a length. It can be a diameter, but if it is a diameter, you would simply say 'The circle is 12 inches diameter'. So; how big is it - it is 12 inches.
100 square inches.
The area as a square has a width of 28.28 inches and a length of 28.28 inches.
A 3mm diamond may imply its dimension at the girdle. If the girdle is on a round diamond, this diamond may measure in the range of 1/10th of a carat.