A report made public today by Rapaport reveals that polished-diamond prices softened in January, with 1-carat stones falling by 0.4% last month and 1.8% compared to January 2018, while 3-carat gems fell by 1.8% last month and 5.9% compared to last year.

Smaller diamonds saw a less steep decline in prices as 0.5-carat rocks fell by 0.3% in January 2019 and 0.1% when compared to last year, and 0.3-carat diamonds dropped by -0.8% in price last month and -4.1% year-on-year.

The analysis is based on the RapNet Diamond Index (RAPI), which is the average asking price in hundred $/carat of the 10% best-priced diamonds, for each of the top 25 quality round diamonds offered for sale on the Rapaport Diamond Trading Network.

According to the firm, the reasons behind the sliding prices are that the US restocking proved slower than expected after the holiday season and the vacation that Far East buyers took ahead of the Chinese New Year. The number of diamonds on RapNet as of February 5 was 26% higher than a year ago

“Although polished prices declined in the second half of 2018, inventory levels have remained high: The number of diamonds on RapNet as of February 5 was 26% higher than a year ago, coming to 1.5 million. In January, rough trading was slow, as De Beers and Alrosa left prices unchanged,” the report reads.