Rapaport Press Release: Trade Cautiously Optimistic for JCK

Price adjustments follow tariff delay.

LAS VEGAS--(BUSINESS WIRE)--The diamond market continued to operate under uncertainty in May. The postponement of higher tariffs, and the accompanying dialogue between the US and India, brought some relief to a market that no longer anticipates a 26% duty on polished.

A US federal court ruled on May 28 that President Donald Trump lacked authority to impose tariffs unilaterally. The levies remain in place while the administration appeals.

Dealers that raised prices in early April adjusted them downward. US consumer demand remained steady — a bright spot for the industry as it heads into the JCK Las Vegas show.

RAPNET DIAMOND INDEX (RAPI™)
	Index	May	Year to Date Jan. 1, 2025 - Jun. 1, 2025	Year on Year Jun. 1, 2024 - Jun. 1, 2025
RAPI 0.3 ct.	1,190	0.4%	13.7%	-7.2%
RAPI 0.5 ct.	1,711	-0.7%	1.8%	-14.9%
RAPI 1 ct.	4,593	0.0%	-0.2%	-16.9%
RAPI 3 ct.	18,202	0.6%	-0.3%	-11.5%
Source: Based on RapNet data.
© Copyright 2025, Rapaport USA Inc.

The RapNet Diamond Index (RAPI™) for 1-carat stones — reflecting round, D to H, IF to VS2 diamonds — was flat during May. The index for 0.30- and 3-carat goods rose 0.4% and 0.6% respectively; the 0.50-carat RAPI fell 0.7%.

Prices of round, 0.50- to 0.70-carat, SI diamonds softened, partly because of the tariff policy readjustment and the desire to complete sales before the July summer vacation.

In late March and early April, the trade exported unusually large quantities of goods to the US to avoid tariffs. This created supply-demand imbalances, including a surplus of less-desirable goods. Sought-after diamonds remained scarce and costly to import because of the 10% duty.

Preparations for JCK are at their peak. Dealers expect a reasonable show, with fewer international participants due to the tariffs. The industry is waiting to see how Trump’s policy affects demand.

The GemGenève show — which ended May 11 — was good, though not excellent, with strong demand for diamonds over 5 carats. It was a positive indicator for high-end items.

A report claimed De Beers had sold cut-price rough to certain clients through special deals, creating waves in the industry. De Beers also announced the closure of its Lightbox synthetic-diamond venture.

The GIA is updating its synthetic-diamond reports, using broader grading terminology that excludes color and clarity.