What is meant by “surface graining not shown” on a diamond certificate?

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Posted by Robert Hensley
Asked on July 12, 2014 4:09 am
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Surface Graining is Not Shown on a Plot

In diamond terminology, “surface graining” is a ridge or group of ridges on the surface (graining is also possible inside) a diamond that show up when you look at an angle under the right light. They are caused by a change in the direction of the grain of a diamond, just like the slight ridges formed by the grain of polished wood.

To see them you will need to find the right angle under a light under high magnification — the same way you might look for fingerprints on a polished table. To show surface graining on a plot would make it appear far more significant, so they are normally not drawn. Surface graining is not important by itself, since it is only visible under high magnification and is already considered in the total clarity grade. This is standard procedure, quite common in diamonds, and not something you should worry about.

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Posted by Robert Hensley
Answered on July 18, 2014 2:56 am
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