A half carat diamond is usually 5 1mm in diameter.
Diamond carat sizes.
This is important when considering the faceting and shape because as you can see in the diamond weight chart above certain shapes will appear larger in size at equivalent carat weights.
The diamond on the left is 1 00 carat and has a good cut.
Today a carat is equal to exactly 0 2 grams about the weight of a paper clip.
The surface area is 6 23x6 26mm.
How large is a half carat diamond.
So while the one carat is double the weight the face of the half carat diamond is only 21 smaller.
Hopefully this clears up the misunderstanding of carat weight and actual sizes.
The surface area is 6 23x6 2mm.
Likewise the physical size of a 2 carat diamond 8 2mm diameter isn t twice as big as that of a 1 carat diamond 6 5mm diameter.
Diamonds are sold by the carat shown as ct which is actually a unit of weight though most think of a carat in terms of size.
To compare that a one carat diamond is 6 4mm.
So even though the two diamonds have different carat sizes they have the same surface area because of the poorer cut of the first one about 10 of the carat weight is wasted.
Printable carat weight to mm chart.
The diamond on the right weighs in at 0 92 carats and has an excellent cut.
The word carat comes from the carob seed the original unit of measure for diamond traders.
That is 1 5th of an inch.