HomeDiamond Carat

Carat - The easiest of the five c's to understand. The "carat" is a measure of weight. The larger the diamond is the larger the carat weight figure will be.

Many times you will hear the term "points" in reference to diamond weight. If you think of 1 carat as 1.00 dollar, then a ¾ carat diamond is .75 cents or 75 "points". It is expressed as .75 ct. When you see ".ctw" after a weight it means that more than one diamond adds up to a total combined weight of three quarters of a carat. CTW means "carat total weight".

It is important to understand that the value of diamonds increases exponentially. By that we mean that a one carat diamond (1.00 ct) can cost much more that simply twice the price of a half carat diamond (.50 ct) even though it weighs twice as much.

Diamond Shape and Carat Reference:

Emerald

Weight in Ct. 0.50 0.75 1.00 1.25 1.50 2.00 2.50 3.00
Emerald Emerald Shape Diamond - 0.50 Carat Emerald Shape Diamond - 0.75 Carat Emerald Shape Diamond - 1.00 Carat Emerald Shape Diamond - 1.25 Carat Emerald Shape Diamond - 1.50 Carat Emerald Shape Diamond - 2.00 Carat Emerald Shape Diamond - 2.50 Carat Emerald Shape Diamond - 3.00 Carat
LxW in mm. 6x4 7x4.5 7x5 8x5 8.5x5.5 9x5.5 9.5x6 10.5x6

Marquise

Weight in Ct. .04 .06 .08 .11 .15 .20 .25 .38 .50
Marquise Marquise Shape Diamond - .04 Carat Marquise Shape Diamond - .06 Carat Marquise Shape Diamond - .08 Carat Marquise Shape Diamond - .11 Carat Marquise Shape Diamond - .15 Carat Marquise Shape Diamond - .20 Carat Marquise Shape Diamond - .25 Carat Marquise Shape Diamond - .38 Carat Marquise Shape Diamond - .50 Carat
LxW in mm. 3x1.5 3.5x1.8 4x2 4.5x2.2 5x2.5 5.5x2.8 6x3 7x3.5 8x4

Oval

Weight in Ct. 0.50 0.75 1.00 1.25 1.50 2.00 2.50 3.00
Oval Oval Shape Diamond - 0.50 Carat Oval Shape Diamond - 0.75 Carat Oval Shape Diamond - 1.00 Carat Oval Shape Diamond - 1.25 Carat Oval Shape Diamond - 1.50 Carat Oval Shape Diamond - 2.00 Carat Oval Shape Diamond - 2.50 Carat Oval Shape Diamond - 3.00 Carat
LxW in mm. 6x4 7x5 7.5x5 8x5.5 9x6 9x6.5 9.5x6.5 10.5x7

Pear

Weight in Ct. 0.50 0.75 1.00 1.25 1.50 2.00 2.50 3.00
Pear Pear Shape Diamond - 0.50 Carat Pear Shape Diamond - 0.75 Carat Pear Shape Diamond - 1.00 Carat Pear Shape Diamond - 1.25 Carat Pear Shape Diamond - 1.50 Carat Pear Shape Diamond - 2.00 Carat Pear Shape Diamond - 2.50 Carat Pear Shape Diamond - 3.00 Carat
LxW in mm. 7x4 8x5 9x5 9.5x5.5 10x6 11x6.5 12x7 13x8

Princess

Weight in Ct. .02 .05 .10 .16 .27 .41 .52 .65
Princess Princess Shape Diamond - .02 Carat Princess Shape Diamond - .05 Carat Princess Shape Diamond - .10 Carat Princess Shape Diamond - .16 Carat Princess Shape Diamond - .27 Carat Princess Shape Diamond - .41 Carat Princess Shape Diamond - .52 Carat Princess Shape Diamond - .65 Carat
Length in mm. 1.5 2.0 2.5 3.0 3.5 4.00 4.50 5.00

Round

Weight in Ct. .02 .03 .05 .10 .20 .25 .35 .40
Round Round Shape Diamond - .02 Carat Round Shape Diamond - .03 Carat Round Shape Diamond - .05 Carat Round Shape Diamond - .10 Carat Round Shape Diamond - .20 Carat Round Shape Diamond - .25 Carat Round Shape Diamond - .35 Carat Round Shape Diamond - .40 Carat
Dia. in mm. 1.8 2.0 2.4 3.0 3.8 4.1 4.5 4.7

Trillion

Weight in Ct. .05 .07 .12 .16 .25 .32 .40
Trillion Trillion Shape Diamond - .05 Carat Trillion Shape Diamond - .07 Carat Trillion Shape Diamond - .12 Carat Trillion Shape Diamond - .16 Carat Trillion Shape Diamond - .25 Carat Trillion Shape Diamond - .32 Carat Trillion Shape Diamond - .40 Carat
Length in mm. 2.5 3.0 3.5 4.0 4.5 5.0 5.5

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