Diamond Cutting – What Are the Steps in Cutting and Polishing a Diamond?

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Many people may not know this but diamonds were not always the brilliant gemstones that they are often seen as today. In fact, prior to the 15th century, diamonds used to be worn in an “as is” condition, which means that they were neither cut nor polished. How they arrived out of the mine was how they were worn. Starting in the 15th century, diamonds began to be polished and cut so they were not only shiny but well fashioned also. For those who wish to know a bit more about the diamond cutting process, the following will describe this procedure in addition to the polishing aspect of this beautiful gemstone.

Steps in Which a Diamond is Cut and Polished

After the diamonds have been collected and sorted, it is at this time in which they are cut and polished. There are special facilities in different areas throughout the world which strictly handle the act of cutting and polishing diamonds. The first step is to cut the diamond. The diamond is cut into various facet amounts. For example, a popular cut of diamond is the round brilliant consisting of 57 facets (58 if the culet is polished). It is important that the diamond is cut neither too much nor too little, as the purpose of the best cut is to produce a diamond with brilliance and fire characteristics. Once the diamond has been cut, the gemstone will be polished into a smooth diamond surface. It is at this time when the diamond is classified according to the 4 Cs: cut, color, clarity and carat. The finished result is a brilliantly shiny, smooth diamond gemstone due to the particular diamond cutting and polishing processes which it has just undergone.

Why Cut and Polish a Diamond?

Some may wonder why it is so important to have a diamond undergo diamond cutting and polishing. The main reason is to produce the final result which is so coveted today, which is a bright and breathtaking gem. When a diamond has not gone through the diamond cutting and polishing process, it is quite a dull and jagged edged stone which many may not deem as lovely as the final result seen in jewelry cases of jewelry stores everywhere. Every product needs a touch up here and there and the same can be said about diamond gemstones. The diamond cutting and polishing process is done to make the diamond the beautiful gem that it is these days.


  1. I have a 2.26 carat round diamond. I wanted to trade it in for another diamond, but my jeweler tells me that my diamond has some very slight wears and scratches on it. He tells me that it will have to be “regrinded” and it will lose about .25 of a carat in the regrinding process. Does that sound right? If so, what becomes of my GIA certificate? Would I need a new one reflecting the smaller diamond?

  2. Hi Don,

    What is the GIA grade now and what does your jeweler predict that the grade will be after re-cutting.

    I’m not sure what he means by “regrinding”. It’s either re-cut or re-polished.

    Let me know what he says and I’ll try to help you make a decision.



  3. The GIA grade is an SI1 and I color. For Polish and symmetry, it says GOOD. The table is 58% and the deph is 63.2%. Cutlet says Small.

    The ring was worn for about 3 years and the jewler said it sustained some scrathes, some edges or factes were compromised, etc , when he viewed it under a 10X loupe. maybe I am not sure of the exact word that he used, but he said the diamond would have to be reconditioned (grinded, polished, re cut,or whatever, to get rid of the dull and compromised edges of the stone). He described it as putting it on some kind of machine to have it re surfaced or sanded to make the worn edges of the stone appear as new. He said the process would cause my diamond to lose about .25 of a carat. Seems like alot of weight. What is your take on this?

  4. Hi Don,

    Take the diamond back to your jeweler and have him send it to Alex Franckel. I have included a link to his website below.

    I have used his services for many years and believe that he can repair your diamond with much less weight loss than you were told.

    Follow the instructions on his website and he will take care of your diamond.

    Keep me posted on your progress.




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