Diamond Education

Diamond Education

Bomi Grelick has been buying only quality diamonds and gemstones since 1935. Our diamond buying experts assure every diamond we sell meets the high standards we have set for the Bomi name. Below you will find some helpful information about diamonds including their color, clarity, cut and carat. However we encourage you to stop by our store and talk to our experts who can show you the many characteristics and options.


Diamond Color

A diamond's color is expressed as a letter grade on a scale from "D" to "Z". A grade of "D" is the highest possible, while "Z" is the lowest. Colorless diamonds are considered the most desirable and attractive. At Bomi Grelick most of our Diamonds are in the "J" to "D" range. See the chart below for more information.

GIA Color Grading Scale


GIA Color Grading Scale


Diamond Calrity

Most diamonds have internal natural characteristics and imperfections. The visibility of these characteristics and imperfections, as viewed by the naked eye or under ten power magnification, determines the clarity grade of the diamond. Clarity is rated and represented in the chart below.

GIA Clarity Grading Scale

GIA Clarity Grading Scale

 


Diamond Cut
diamond cut diagram

Maximum brilliance and "fire" in a diamond is a result of correct cutting. The diagram to the right is one example of a diamond that is considered to be an "ideal" brilliant round cut. However there are many other cuts that can produce an "excellent" diamond.

Recent research conducted by the Gemological Institute of America has concluded that there are several proportion combinations that will produce a beautiful diamond that can merit an "excellent " cut grade.

A skillfully cut diamond will have the correct number of facets, properly placed and highly polished. These factors will be used to determine the "polish" and "symmetry" ratings of the diamond.

Below are example shapes of diamonds, which if cut correctly can be highly rated.

Diamond Shapes



Carat is the unit of weight for diamonds and other precious stones. A fraction of a carat is written decimally and expressed as "points". One forth of a carat is 0.25 carat, expressed as "25 points". Other factors being equal, the larger a diamond is, the greater is it's per carat value. For a poorly cut or damaged diamond, value is determined on the basis of the weight it retains after recutting to the correct proportions. The chart below shows the approximate proportions of a round brilliant diamond at various sizes.

NOTE: CHART NOT ACTUAL SIZE