1. Precise control: Lab-grown rough diamonds can be grown under very precisely controlled conditions, including temperature, pressure, and chemical composition. These conditions can be adjusted to control the rate, size, shape and purity of diamond growth.

2. High quality: Due to the control of the laboratory environment, laboratory-grown rough diamonds are usually purer than underground-mined natural diamonds because contamination from soil and other impurities can be avoided. In addition, lab-grown diamonds can also be customized to produce diamonds that require specific properties.

3. Sustainability: Lab-grown diamond rough is a sustainable alternative that reduces reliance on underground resources and reduces negative environmental impacts. In addition, lab-grown diamonds allow for more accurate forecasting of yields, resulting in a more stable supply chain.

4. Low cost: The production cost of lab-grown rough diamonds is usually lower than that of mined natural diamonds, because lab-grown diamonds do not need to be dug or transported underground, and the production process can be better controlled. This means that lab-grown diamonds are available at lower prices, making more affordable diamond products available to more people.