Russian diamond mining company Alrosa said on Tuesday its first-quarter output rose 6 percent year-on-year to 8.4 million carats and revenue from rough diamond sales was set to reach at least $1.1 billion.
Alrosa, the world's top producer by output in carats, also reported that its first-quarter rough diamond prices fell by 3 percent.
However, market conditions are expected to improve thanks to key markets in the United States, China and India, it added in a statement.