66.67 milligrams, or
0.0667 grams, or
1.029 grains for anyone who is crazy enough to use the unit "grains"
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A one-third carat diamond weighs one-third of a carat. If the stone is a round brilliant cut stone, it's diameter measurement at the girdle will be about 4.4mm.
A carat is a unit of weight used for gemstones. One third carat is the weight of the diamond.
Notwo thirds is two times as big as one third
One carat = 1/5th of a gram
Each diamond is valued according to its cut, clarity, carat weight and colour. Five diamonds weighing one carat, collectively weigh one carat.