It's been a surprisingly ugly year for most diamond companies.

Shares of small producers, mainly focused on mines in southern Africa and Canada, have tumbled more than 30 per cent during the past year and each company seems to be embroiled in its own mess.

The issues range from mine setbacks, political fights and low prices for certain types of stones. The volatility is normal for such a speculative corner of the industry, but the losses are surprising since rough-diamond prices have held up relatively well.

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"If you look at diamond stocks this year, performance has been very poor," said William Lamb, chief executive of Canada's Lucara Diamond Corp. "Everybody has been kicked."

The diamond industry is dominated by two giants, De Beers and Alrosa PJSC, and several companies that are a fraction of the size.

It's hard to tell how De Beers, a unit of Anglo American PLC, is faring because the miner is famously secret about its dealings. Alrosa shares are down only 5 per cent in the past year.

Lucara's Mr. Lamb said diamond firms have taken too much of a beating.

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"There's definitely this oversold status with the diamond market," Lucara's Mr. Lamb said. "I'm waiting for the point where everybody starts to realize that the diamond sector has actually been ignored and the investment opportunity is actually quite significant."