carats are a unit of weight. Millimeters are units of volume. So, the question is unanswerable. It's like asking "how many pounds in a foot?".
16mm = 1,6 cm.
About 141.7 carats per ounce.
2267.96185 carats.
1 ounce is 138.29 carats.
There are roughly 2,267 carats in a pound.
30,000 carats.
Five carats.
7 CARATS
44.4 carats = about 0.3132 ounces.
There are 45.52 carats on the hope diamond
3,104 carats = about 21.9 ounces.
One ounce = about 141.7 carats.