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How to Know if the Diamond You Bought Matches Up to the Certification

When making a diamond purchase, there are many factors to consider and you will want to understand the quality of your stone before you make any serious decisions. Once you have decided on your purchase, it is important to verify that you are receiving the exact same stone you picked out. Here’s how to know if the diamond you bought matches up to the certification.


Since no two diamonds are alike, the certificate should serve as a road map to define the individual characteristics and inclusions for absolute accuracy. The certification will have a breakdown of the 4 C’s which are defined as the diamond’s color, carat, clarity and cut. Before your purchase you should view your stone in a 10x loupe to make note of all these factors.

Get to know your diamond and refer back to the certification to see how these specifics match up. Upon return to pick up your diamond, you will want to view this again. Diamonds should also include laser inscription to identify the diamond and note the unique report number which will be included on your certificate. Check your certification to insure it was certified through a noteworthy or accredited gemological laboratory.


The style and cut for the diamond are named on the certificate as emerald, round, oval, pear, heart and marquise. There are also patented names which are not recognized by gemological institutes such as the Princess cut which is described as a square modified brilliant cut. Radiant cut is a rectangular corner modified brilliant and Assher is considered a square emerald.

The measurements of the stone are in millimeters including length, width and depth which makes each diamond especially unique in size. You can check the measurement using a specialty millimeter gauge designed for measuring gems or diamonds. This is very important since it would be very difficult to switch a diamond and replace it with the exact same measurements.


The weight of your diamond will be expressed in carats. A scale will be used to weigh the diamond and other factors will be recorded such as the depth (ratio of depth to the average diameter) and the table (the flat top compared to the diameter). The girdle is also calculated and consists of the thin rim which separates the crown of the diamond from the pavilion.

The words used range from thin to extremely thick. You will also note the finish is included such as unpolished or faceted. The finish will also indicate the grade of the polish of your stone as well as the symmetry which suggests how well the facets in the crown align with the pavilion. These are graded as good, very good or excellent. Cutlets are the small facet located at the bottom of the stone which can range from large to non-existent.


There is only one clarity grade noted using the GIA grading scale. The range begins at best which is IF then VVS1, VVS2, VS1, VS2, SI1, S12, I1, 12, and 13. The clarity of a diamond includes the reflection of the number, size, placement and nature of inclusions or surface irregularities. These can be viewed under a 10x Loupe.


Color grades begin with D and range down to Z. After this there are fancy colors. Colors are determined by comparing them to a master set of stones under special lighting. About 50% of diamonds are fluorescent with about 35% having a level which will impact the appearance. Diamond fluorescence is how ultraviolet light affects the diamond and most fluorescence is blue. There are also other colors such as yellow, green and orange. Faint florescence is a positive feature if it isn’t too strong which would make the diamond appear cloudy in nature.

Understanding how to know if the diamond you bought matches up to the certification is extremely important. Each detail from the major to the minute will have been diagrammed or plotted within the certification. You should be able to quickly identify major inclusions or significant and unique qualities by referring to the map.