Like-for-like valuations dropped 13% at miner’s fifth tender.

May cycle brought in 21% less than a year earlier.

First-quarter sales and profit dropped amid price decline and weakening of product mix.

Company held more tenders than a year earlier.

Miner sells seven diamonds for more than $1 million each, compared to nine a year ago.

Production from South Africa deposit down 56% as company moves from open pit to underground.

Storm Mountain recovered fancy-intense stone in Lesotho on March 23.

Miner had trouble accessing material from open pit at Diavik.

The relationship between the longtime partners is being tested as the deadline for a new marketing deal and mining license approaches.

Fewer tenders during third quarter also affected revenue.