The carat weights given for standard gem sizes in the following chart apply to diamonds cut to ideal proportions.
Actual size 1 2 carat diamond.
Our round diamond size chart will help you convert millimeter mm size to carat size for round cut diamonds.
This 1 2 carat emerald has a face up area of approx.
Mm size of each diamond shape.
Diamonds that have less depth tend to have a larger spread meaning their millimeter measurements are larger without adding carat weight.
Even though the carat weight is 50 of a 1 carat stone it doesn t face up twice as small.
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.
37 5 mm which falls within the normal range for 1 2ct rounds a face up area is the area of the girdle plane and tells you how big the stone looks when viewed from the top as set in a ring.
On the other hand the size of a 5 carat diamond is approximately 5 2mm.
Face up size of this diamond is as you would expect of a 1 2ct round learn more.
Today a carat is equal to exactly 0 2 grams about the weight of a paper clip.
Over one carat a 0 2 mm variance can usually be accommodated sometimes more.
Estimating weights for gemstones.
Use our diamond size chart to predict the carat weight by the mm diameter of a round diamond.
For example selecting a 1 4 carat diamond rather than a 1 5 carat will look nearly the same in physical size but the price tag could be drastically different.
Wondering what a 1 carat round diamond looks link on a hand.
35 48 mm which falls within the normal range for 1 2ct emeralds a face up area is the area of the girdle plane and tells you how big the stone looks when viewed from the top as set in a ring.
The surface area is 6 23x6 2mm.
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.
The diamond on the right weighs in at 0 92 carats and has an excellent cut.
Want to know the actual size of a 1 carat diamond on a hand.
The diamond on the left is 1 00 carat and has a good cut.
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.
Use our diamond size chart to understand the millimeter mm size of each diamond shape.
The surface area is 6 23x6 26mm.
As a general rule gems under one carat can fall within 0 1 mm of the setting size.
Want to know the actual size of a 1 carat diamond on a hand.
Typically gem cutters cut colored.
The word carat comes from the carob seed the original unit of measure for diamond traders.