Market evolution: Polished diamonds (CN 710239) — 2015–2025

Introduction

This report analyses the evolution of the European Union's trade in polished, non-industrial diamonds (Customs Code 710239) over the period 2015-2025. The data reveals a market undergoing significant structural transformation, characterized by a dramatic decline in trade value despite stable or rising physical volumes, a major reorientation of trade partners, and a resulting shift in the EU's trade position and vulnerability. The primary dynamics point towards a deflationary price environment, likely driven by the rise of synthetic diamonds, and a strategic consolidation of supply chains, particularly towards India.

The Great Divergence: Surging Physical Volumes Amid Plummeting Values

The period is defined by a stark and consistent divergence between the physical volume of diamonds traded and their monetary value. While the EU imported and exported greater quantities of diamonds by mass, the total value of this trade collapsed, indicating a fundamental shift in the market's pricing structure.

The collapse in trade value

The total value of EU trade in polished diamonds fell dramatically. Imports declined from €5.41 billion in 2015 to €2.80 billion in 2025, a 48.1% decrease. Exports followed a similar path, falling from €4.65 billion to €2.33 billion, a 49.8% drop (General Overview). This erosion in value is further reflected in the unit prices, which fell by 78.9% for imports and 66.5% for exports over the same period.

Resilience in physical quantities

In contrast to the value decline, physical trade volumes were resilient or grew. The net mass of diamond imports increased by 159.7%, from 4.64 tonnes in 2015 to 12.06 tonnes in 2025. Export mass also grew by 61.5%. The supplementary quantity in carats, however, tells a more nuanced story: import carats were stable (+2.5%), while export carats fell sharply (-54.2%). This indicates that the average size or quality of the diamonds being traded changed significantly, with the EU potentially importing smaller, lower-value stones and exporting a different mix.

Trade Evolution Summary (2015 vs. 2025)

Structural Reorientation: India's Ascendancy and Market Concentration

The geographical pattern of EU diamond trade was profoundly restructured. Trade partnerships with traditional hubs like Hong Kong and China collapsed, while trade became heavily concentrated around India, which solidified its role as the global center for diamond cutting and polishing.

The rise of India and decline of Asian intermediaries

India's position as the EU's dominant supplier strengthened, with its import share growing despite the overall market contraction. In 2015, India accounted for €1.57 billion of EU imports; by 2025, this figure was €1.62 billion, representing a 3.6% increase in a market that halved in total value (Top Partners by Value). Conversely, imports from Hong Kong and China plummeted by over 90%, signaling a bypass of traditional trading intermediaries in favour of direct sourcing from the processing hub.

Increased import concentration and Belgian dominance

This shift led to a dramatic increase in the concentration of the EU's import sources. The Herfindahl-Hirschman Index (HHI) for import value more than doubled, from 1,454 in 2015 to 3,555 in 2025, indicating a move from a fragmented to a highly concentrated supply structure (Concentration HHI). Within the EU, Belgium's role as the central trading hub persisted. Belgium remained the primary reporter for both imports and exports, though its absolute trade values fell in line with the market, accounting for 86% of EU import value and 83% of export value in 2025 (Top Reporters by Value).

Evolving EU Vulnerability and Market Shocks

The EU's trade balance and vulnerability indicators shifted notably, while the market experienced significant, though isolated, price shocks. The bloc transitioned from a net exporter position at the start of the period to a net importer by the end.

From net exporter to net importer

In 2015, the EU had a positive net import reliance of -35.2% (indicating it was a net exporter). By 2025, this had swung to +65.1%, meaning the EU became a significant net importer of polished diamonds (Net Import Reliance). This reversal, occurring amidst a falling trade deficit, underscores the depth of the value collapse. The EU's high export propensity (887% in 2025) confirms the sector remains highly export-oriented in volume, but its economic viability is challenged by low prices.

Evidence of price shocks and volatility

The data records specific price shocks, notably a 1,522.1% price spike for exports to the United Kingdom in 2021 and a 111.8% increase for exports to Switzerland in 2022 (Top Shock Events). These are likely linked to pandemic-related supply chain disruptions and inventory shifts rather than sustained demand. The overall volatility, measured by the coefficient of variation (CV), remained high for key partners like the UK (CV=1.40 for exports), indicating a market prone to erratic price movements.

Conclusion

The EU market for polished diamonds (CN 710239) between 2015 and 2025 underwent a transformative deflation. The core narrative is one of volume resilience masking a severe erosion in value, fundamentally altering the market's economics. This price collapse is the primary driver behind the other observed trends: the strategic consolidation around India as the low-cost processing center, the resulting increase in import concentration, and the EU's shift to a net importer status despite high export volumes. The data suggests an industry adapting to the competitive pressure from lab-grown diamonds, restructuring towards higher volumes of lower-value goods. Future stability will depend on the industry's ability to navigate this price-competitive landscape and the potential for further shocks in a concentrated and volatile market.