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
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
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
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.