Anglo American’s De Beers, the world’s No.1 diamond miner by value, has just had the lowest sales for its seventh cycle since it began releasing data in 2016, as it let customers delay acquiring smaller stones for the first time.

Sales for the cycle stood at a provisional $505 million, down 5.5% from the $533 million obtained in the previous cycle of the year and 0.4% from $507 million for same period in 2017.

“De Beers Group provided Sightholders with the opportunity to re-phase the allocation of some smaller, lower value rough diamonds.” chief executive officer, Bruce Cleaver, acknowledged in the statement.

The unusual move (De Beers is known for requiring buyers to take what’s offered) says lots about the state of the low-end diamond market. The last time the company did something similar, in fact, was two years ago, when India’s move to ban high-value currency notes pushed down demand.

Sales were down $134 million or 21% compared to the same cycle in 2016, when De Beers began releasing this kind of data.

The diamond giant has about 80 handpicked clients called sightholders who are allocated parcels of diamonds sorted and aggregated in Gaborone. The 10 annual sales events are known as sights.

De Beers’ new strategy for small stones, paired with its looming entry into the lab-grown stones market, have many in the industry worrying about prices.

Cheaper diamonds, which are often small and low quality, are selling for a lot less now than five years ago. And when it comes to synthetic stones, De Beers’ entry in the market will create a big price gap between mined and lab diamonds, pressuring rivals that specialize in synthesized stones at the same time.

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