If a diamond is a round cut, the mm size at the girdle is about seven if the diamond weighs about 1.25 carats.
Other gemstones have different weights relative to their mm measurements.
The carat size of a diamond should be determined by a certified jeweler. There are two different sizes the is the millimeter size which as stated was 7mm and then a jeweler can give a carat size.
Since cushion cut is a rather square cut, one must assume that your diamond measures 7mm x 7mm. In this case, it weighs approximately two carats.
if it means inches. i still don't know what a 7mm means. i just want to know what carat it is? <><><><> MM is the abbreviation for millimeter- a measure of size. 25.4 mm = 1 inch. 7mm is just larger than a quarter inch. It has no connection to purity of gold, which is measured in karats (k not c) Carat with a C refers to the weight of a gemstone.
A carat diamonds size is 3.5mm.
There is no direct relationship per se between MM measurements and carat weight of gemstones.In order to ascertain the carat weight of the baguettes, take them to a jeweler that you trust and ask that they be removed from their setting and weighed.
The 7mm designation is a reference to the bore size, or diameter. In decimal size it means this rifle has a barrel groove diameter of .284 inch.
Carat is not a measurement of size, its weight. 200 miligrams=1 carat
These gemstones weigh the same: one carat.
If 7.7 is the carat weight, then the size is 7.7 carats. The millimeter measurements of a diamond with this weight will vary, depending on the cut.
each carat is 200 miligrams
carat
A two carat round brilliant cut stone will measure about 8.2 mm. A different cut will have a different measurement.