Petra Diamonds Limited has several competitive edges that differentiate it from its peers -

1. High-quality diamonds - Petra Diamonds is known for producing high-quality diamonds, including some of the largest and most valuable diamonds in the world. This has helped the company establish a strong reputation in the industry and attract premium prices for its diamonds.

2. Diversified portfolio - Petra Diamonds has a diversified portfolio of mines in different regions, which helps mitigate risks associated with operating in a single location. The company also has a mix of underground and open-pit mines, which allows it to extract diamonds from a variety of sources.

3. Strong relationships with customers - Petra Diamonds has established strong relationships with its customers, including some of the world's leading diamond manufacturers and retailers. This has helped the company secure long-term contracts and stable demand for its diamonds.

4. Focus on sustainability - Petra Diamonds is committed to sustainable mining practices and has implemented a range of initiatives to reduce its environmental impact and support local communities. This has helped the company build a positive reputation and attract socially responsible investors.

Overall, Petra Diamonds' focus on producing high-quality diamonds, diversifying its portfolio, building strong customer relationships, and prioritizing sustainability has helped it differentiate itself from its peers and establish a strong position in the diamond industry.