At Sage Jewelers, we believe that diamond education is an important part of the jewelry buying process. From color to clarity to cut and weight, we want to be sure that you have all the knowledge and resources you need in order to craft the custom diamond jewelry piece of your dreams. To learn more about diamonds, call or stop by our Northfield jewelry store.



Although they may look colorless, most diamonds actually have a small amount of color.

The Gemological Institute of America (GIA) has created a color scale that extends from D (colorless) to Z (light yellow or brown). Color grades are determined by examining each diamond in a controlled environment. Each letter represents a level of discernible color.


Diamonds have a fingerprint. Not in the human sense, but in the sense that they each have a unique pattern of imperfections called “inclusions.” Almost every diamond has inclusions (truly flawless diamonds are extremely rare); they are caused by the heat and pressure necessary to create diamonds and contribute to the stone’s character. A diamond’s clarity is a measure of its inclusions. The GIA Clarity Scale includes 11 clarity grades ranging from Flawless to I3.


Before the first cut on a diamond is even made, the gemstone is carefully mapped to determine what kind of cut will maximize its brilliance. A cut and polished diamond’s radiance is based on its relationship with light: how light strikes the surface, how much enters the diamond, and how much – and in what form – light returns to your eye. A diamond cut with correct proportions maximizes its interaction with light. The result is spectacular fire and brilliance.

Carat Weight

Contrary to what many people think, a diamond’s carat weight is a measure of the gemstone’s weight, not its size. One carat equals 200 milligrams in weight. Each carat is divided into 100 points. A 1-carat diamond = 100 points, a .75-carat diamond = 75 points, etc. Remember, diamonds with the same carat weight can vary greatly in value, depending on color, clarity, and cut. Choosing the perfect diamond is a matter of deciding what matters most to you then finding the best combination of factors to suit your needs.

Another important aspect of diamond education is sizing. When it comes to your diamond jewelry, it’s important to have professional sizing done by a jeweler. Our Northfield custom jewelers will take the time to size your ring correctly to avoid the hassles of ring loss.