Clarity, Diamond Prices, Purchasing

What Is Diamond Polish And How Does It Affect Your Purchase?

 white diamond polishBuying diamonds can be very expensive, especially if you opt for a diamond with high grades. There are numerous elements that a person should consider when they want to buy a diamond – and most of these elements affect how the diamond looks and, of course, how much the diamond will cost. Being educated about the many terms that are used to describe the various aspects of a diamond that is taken into account when it is valued can help you make a better decision when you buy a diamond. This can also help you avoid being ripped off and end up paying more than you should for a diamond that is not worth much money.

How A Diamond Is Graded

A diamond cannot be sold without an official diamond certificate number. This is why companies that manufacture jewelry that contains diamonds first need to send a diamond to a grading facility to have a professional rate the diamond’s quality. Once the diamond’s grading process has been completed, the appraiser is able to offer the jeweler with an appropriate value so that they can price the final product that the diamond will be used in appropriately. Apart from the fact that the diamond grading process helps to determine the value of a diamond, it is also a way to verify that a diamond is legal and that it is sold at an appropriate price. After the grading process, a diamond grading certificate is provided to the jewelry retailer, which can then be given to the buyer to offer them credentials and proof that the diamond has been graded by a professional institute.

diamond clarity grade

During the standard grading scale, four particular aspects of the diamond are taken into consideration to determine the quality of the diamond and to specify the value of the stone. These aspects are often referred to as the “4 Cs of diamond quality”. The 4 Cs include the carat weight of the particular diamond, the cut quality of the diamond, the clarity rating of the diamond being graded and the color of the diamond.

What Does Polish Mean

One term that you will find on a diamond certificate that is not officially part of the 4 C’s that are used to grade a diamond is “Diamond Polish”. This term is partly similar to the clarity rating of the diamond, but there is still a significant difference between the two. While the clarity of the diamond refers to inclusions, blemishes and other imperfections that can be observed on the inside of the diamond, diamond polish rating rather refers to how well the diamond has been polished and whether or not imperfections, such as cuts and inclusions, can be observed on the outside of the diamond.

Your Diamond Teacher explains that inclusions on the outside of a diamond are often called “wear and tear” damage. These inclusions usually occur during the cutting process. Once the diamond has been cut, it goes through a polishing process that smooth the surface of the diamond and reduce the visible appearance of inclusions. Excellent is the most ideal grading for the polish rating of a diamond, but many people find that opting for a “good” rating also results in a good looking diamond at a reduced cost.


A diamond’s polish may not have too much of an impact on its price, with most of the higher polish grades looking very similar, but it is still an important part of the diamond grading process that should not only be considered by the jeweler, but also by the potential buyer. Thus, the polish of a diamond is a term that potential buyers should educate themselves about as the grade will be provided on the diamond’s grading certificate. 

Learn more about how I got my start in the diamond industry and why that matters to you on our home page.



Mary Turner


With experience dating back to when brick and mortar was the ONLY source for shopping for diamonds, I have countless men find the perfect diamond for that special occasion. As your Personal Diamond Consultant, I'm here to make sure you end up with the perfect stone.

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