The Process of Transforming a Rough Diamond into a Polished Diamond

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Diamond Cutters

Rough Diamonds Transformation

The process of transforming a rough diamond into a fully polished gemstone is something most customers are not aware of. As you would probably know, most of the gemstones that occur naturally on the earth’s crust are subjected to a number of enhancement processes in order to improve their characteristics and to make them suitable for making diamond rings.

The enhancement processes implemented by diamond cutters and manufacturers allows them to transform unappealing rough diamonds into stunning stones with superior characteristics. However, these processes require tremendous precision and attention to detail, and it must be carried out in a specific set of steps. Some of the most important processes that are involved in the process of transforming rough diamonds into polished ones are the following.


The first and most important step is the planning. During this stage, diamond cutters thoroughly evaluate the diamond in order to determine how it should be cut. Cutters use the 3D images of the rough diamond during the evaluation process to identify the right angles for obtaining the best color from the stone. In addition to that, this phase is also about determining the accurate cut that suits the gemstone; this allows diamond cutters to considerably increase the brilliance of the diamond.

Some diamonds are well suited for an oval shaped cut while others are best suited for a round cut. So, it is crucial to determine the best cut that suits the rough diamond before moving on to the next steps.

Sawing or Cleaving

Some of the raw diamonds are used for making a single stone while others are suitable for making multiple numbers of diamonds. Expert diamond cutters will initially evaluate all the characteristics of the diamond including the stone and finally determine whether to use the stone for making multiple numbers of separate diamonds or a single one.

During the cleaving or sawing stage, diamond manufacturers incorporate the use of handy cutting tools such as lasers, saws, and blades. These tools are then used to separate the rough diamond into tiny pieces. This is a highly sophisticated process and if the cutting process did not go quite well, then it might even make the stone unsuitable for making diamond rings.


The process of bruting is also called as girdling by diamond cutters and manufacturers, and it is also considered as one of the most vital phases of the entire process. The rough gemstone starts to take its real shape during the process of bruiting. The main tools used in this process are lathe and dop.

During this process, lathe rotates one of the diamonds while a dop is used for rotating another gemstone. The process of digital imaging is often used in this process because it enables diamond manufacturers and cutters to identify the speed of rotation and to identify the desired dimensions. The best attributes of the stone can also be studied with the help of a diamond loupe.


Cutting the facets of the diamond and other types of finishing polishing processes are usually included in this stage. In order to polish the facets of the stone, diamond cutters will use the dop to hold the gemstone in right place at the exact angles. The diamond is then grinded against a sharp blade when it is spinning and finally lanolin or oil is applied to the ring to lubricate it.

The above-mentioned process is repeated for each and every facet of the diamond. The facets in the diamonds are polished by using polished pads and a polishing wheel. If any coarse marks are found on the polished facets of the diamond, then they are also removed by the diamond manufacturers by implementing the right methods. The ultra-fine polishing of diamonds brings out the entire light-reflecting properties of the stone.

Final Inspection

Once the polishing processes are completed, each and every diamond is thoroughly evaluated by the diamond experts. If they identify any sort of extra flaws on the surface of the stone, then they will send the diamond back for further polishing. However, in some cases, diamond manufacturers often subject the diamond to enhancement processes in order to fill in the cracks and holes within the stone.

It is significant to note that some diamonds might develop permanent damages when they are subjected to such processes. Therefore, when it comes to some diamonds, manufacturers prefer not to implement any color or clarity enhancing processes. Still, diamond manufacturers will put in extra efforts to ensure that all the flaws and other issues in the diamond are fixed. If not, they will not use such diamonds for making diamond rings or any other pieces of jewelry.

Once the final inspection process is completed, diamond manufacturers usually sell the diamonds to a reputed diamond grading organization to certify them. Customers will be able to learn more about the properties of the diamond through the diamond certification documents of the stone.