How many grams are lost from the rough diamond to the finished diamond? Diamond rough cutting loss

The rough diamonds mined in nature are rough diamonds. In order to become the finished brilliant diamonds sold in jewelry stores, it has to go through a series of cutting and polishing processes, and in this process, there will be indefinite losses. According to related knowledge, the loss of rough diamonds to finished diamonds is about 40%-50%, and the loss of finished products cut into different shapes is also different. The following is an introduction to the cutting loss of rough diamonds.

Factors Affecting Cutting Loss of Rough Diamond

Loss rate: Loss rate refers to the percentage of the process loss of processed diamond products to the quality of diamond raw materials (total input of raw materials) under normal production conditions (loss rate = 1-yield rate).

The cutting loss rate of rough diamonds is affected by many factors, such as:

①The quality specifications of the diamond raw materials, including the weight of the diamond raw materials, the crystal shape of the diamond raw materials, the size and location of the flaws in the diamond raw materials.

②The requirements of the diamond raw material supplier, such as keeping the weight of the diamond as much as possible; reducing the impact of flaws on the clarity level as much as possible; adopting the prescribed cutting and grinding work for marketability; selecting specific processing for saving labor and time Craft.

③The level of diamond processing enterprises, including the technical proficiency of workers and the advanced level of processing equipment, etc.

For different batches or the same batch of diamond blanks, due to the different combinations of the above factors, the diamond processing loss rate of different companies or different batches of the same company may also have certain differences.

Diamond rough-cutting loss

Cut the rough diamond into different shapes, and the loss rate is also different. For example, round diamond cutting is very material-consuming, generally, only 40% to 50% yield rate; the production rate of special-shaped diamonds is relatively high, generally, 60% to 70%, which is also cheaper than round diamonds. One of the reasons, that round diamonds can reflect the best brightness and fire color of diamonds.

It is worth mentioning that when diamond dealers who pursue perfection cut rough diamonds, they will deliberately avoid blemishes in the diamond to make the diamond show better results. For example, The Cullinan Diamond, the world’s largest rough stone, weighs 3,106 carats and is finally cut into 105 diamonds of different sizes. The total number of these 105 polished diamonds is 1063.65 carats, which is equivalent to 2024.35 carats of diamonds were wasted, and the attrition rate was about 65%.

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