Diamond Education

Every diamond is a miracle of time and place and chance. Like snowflakes, no two are exactly alike.

Until the middle of the twentieth century, there was no agreed-upon standard by which diamonds could be judged. Gemological Institute of America (GIA) created the first – and now globally-accepted standard – for describing the quality of diamonds: Carat Weight, Color, Clarity, and Cut.

The creation of the 4Cs meant two very important things: diamond quality can be communicated in a universal language and diamond customers can have a better understanding of exactly what they are about to purchase. At SFD, we accurately grade each diamond’s characteristics, so our customers can be confident about the quality of the diamonds they are buying.

Carat Weight

Diamond carat weight is the measurement of how much a diamond weighs. A metric “carat” is defined as 200 milligrams.

Each carat can be subdivided into 100 ‘points.’ This allows very precise measurements to the hundredth decimal place. A jeweler may describe the weight of a diamond below one carat by its ‘points’ alone. For instance, the jeweler may refer to a diamond that weighs 0.25 carats as a 'twenty-five pointer'. Diamond weights greater than one carat are expressed in carats and decimals. For example, a 1.08 carat stone would be described as 'one point oh eight carats'.

All else being equal, diamond price increases with carat weight because larger diamonds are rarer and more desirable. However, two diamonds of equal carat weight can have very different values (and prices) depending on three other factors of the 4Cs:, Color, Clarity, and Cut. It's important to remember that a diamond’s value is determined using all of the 4Cs, not just carat weight.