Educational Home > Diamond Education > The 4 C's > Carat
On Anjolee’s product page under step 2, the numbers on the dropdown menu refer to the total carat weight of the selected style. Once selected, the number and size of the stones set in the piece will be shown.
A diamond's weight is measured in what is known as a "Carat", which is
a small unit of measurement equal to 200 milligrams. Carat weight is commonly expressed in points or fractions. There are 100 points per 1 carat. For example, 0.33 carats is usually expressed as 33 points, or 1/3 of a carat.
The charts below show the relative size of carat weights for different diamond shapes.
What does total carat weight mean?
The diamond's total carat weight is a combined minimum carat weight of all the diamonds in a piece of jewelry. An example is if a pair of diamond stud earrings has a total diamond carat weight of ½ (.50) carat, each earring in this pair would have an individual carat weight of ¼ (.25) carat.
However, the actual diamond you purchase may weigh slightly more or less than the fractional weight specified. Because of this, the Federal Trade Commission has strict guidelines about the range of carat weight that a fraction can represent. The chart below shows the satisfactory ranges for carat weights expressed as fractions.
• 1/4 carat total weight may be 0.21 to 0.29 carats
• 1/3 carat total weight may be 0.30 to 0.36 carats
• 1/2 carat total weight may be 0.45 to 0.59 carats
• 3/4 carat total weight may be 0.70 to 0.84 carats
• 1 carat total weight may be 0.95 to 1.10 carats
• 1 1/4 carats total weight may be 1.20 to 1.29 carats
• 1 1/2 carats total weight may be 1.45 to 1.55 carats
• 2 carats total weight may be 1.95 to 2.05 carats
Why is carat weight important?
The carat weight of a diamond is one of the major factors affecting its price, along with cut, clarity and color.
Larger diamonds are rarer than small ones, so its value increases exponentially for higher carat weights.
How does carat weight affect diamond size?
As diamond carat size increases, the diameter and the depth of the diamond will also increase. This is the reason a 1 carat diamond approximately 6.5mm in diameter will not look twice as wide as a 1/2 carat diamond that is approximately 5mm in diameter.