Color is also a major determinant of value.
There are naturally occurring colored diamonds – green, blue, red, and many pastels – but these are rare and very expensive.
Normally when we talk about the color of a diamond, we’re referring to “white” diamonds that are supposed to be colorless.
The finest and rarest of these stones are indeed completely colorless.
The industry grades the color of diamonds using a variety of different scales. The most common is the Gemological Institute of America (GIA) system.
The highest GIA color grade is D. Stones graded as D, E, or F are considered to appear colorless.
The G through J grades, called “near colorless” may look colorless to the untrained eye if they are well cut and set in jewelry.
K, L or M diamonds have a faint yellowish tint.