Why are diamonds so cheap in Dubai?

I'm curious, could you elaborate on why diamonds seem to be priced significantly lower in Dubai compared to other parts of the world? Is it due to the city's status as a major trading hub for precious stones, allowing for more competitive pricing? Or perhaps there are specific factors unique to Dubai's market dynamics that contribute to the lower prices? Additionally, are there any quality concerns associated with diamonds sold in Dubai, or are they just as authentic and valuable as those found elsewhere?