How to Read a Diamond Certificate


How do you read a certificate? Look at copies of a GIA certificate and an EGR certificate. Since the EGL certificate has more information it's look at it in some detail. The weight is listed in carats of the diamond. Since the diamond is less than a carat .87 carat and should be expressed as 87 points. The diamond preferred to on the certificate is the common popular round brilliant cut so all of the proportions referred to on the certificate we'll apply to that type of design as discussed earlier.

There are two sets of figures to explain the measurement. The first set of numbers refers to the diameter of the stone expressed in millimeters. The first is the widest point of the stone which is measured around girdle and is the narrowest point. In other words the stoneis not perfectly round almost no stone is perfectly round and nearly all stones will show two figures for the diameter. The next measurement is for the height of the diamond from the table to the culet.

Proportions preferred to the symmetry of the Stone the general shape and configuration of facets and angles. Next is the depth percentage. The ratio of the height or length of the diamond to the diameter at the girdle. Next this figure in percentage is the width of the table which is the large flat eight sided facet on top of the diamond at its widest point relative to the total diameter of the diamond at the griddle. The Crown Heights is a percentage which expresses the ratio of the distance between the table in the girdle or the crown to the distance between the table in the culet.

The pavilion depth is the other part that together with the Crown height makes up the total depth percentage with the small edition of griddle thickness. Pavilion is the area below the girdle which comes to a culet. The perpendicular distance from the girdle to the culet taken as a percentage of the total length of the diamond is the pavilion depth. The griddle fitness is described as the girdle of the stone this certificate refers to a medium thickness and has been polished. Some cutters do not polyp should the girdle. The girdle separates the Crown which is the top of the stone from the pavilion which is the bottom of the stone and its thickness which should be fairly even all around circumference this is a small factor in the total depth percentage of the diamond.

The finish grade is also known as polish this phrase refers to the condition of the diamond surface area. This stone has been given a top grade of good. The purity or the color grade the stone was given a grade of DVS two. This stands for very very slight inclusions and because the inclusions or flaws or relatively easy to detect and relatively centered on the stone it rated the grade of PVS to within the DVS category instead of the VS one. The inclusions referred to are marked on the diagram at the center right of the certificate. The left diagram is a top view of the Stone. The right diagram is a bottom view. The inclusions which have been somewhat exaggerated in size here are in order to be visible are placed by the gemologist just at the exact spot on the diagram with a peer in the actual stone.

For the color grade the EGL has its own numbered color grading system. This stone has a one plus grade which corresponds to the G.I. is effed. And that is given in parentheses. This particular grade means at the diamond is in the third fest grade of the colorless category. Photo on essence is when a diamond has traces of luminescence they can be detected in ultra violet light. 

© 2018 John Ralph. All rights reserved.
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