Market evolution: Diamond grinding wheels (CN 680421) — 2015–2025

Introduction

This report analyses the evolution of EU trade in diamond grinding wheels (customs code 680421) over the period 2015–2025. The product covers millstones, grindstones, grinding wheels and similar tools made of agglomerated synthetic or natural diamond, used for sharpening, polishing, trueing or cutting, and is critical to advanced manufacturing sectors including automotive, aerospace, electronics and precision engineering. The scope and definitions confirm the product's industrial significance, with the EU production code (Prodcom 23.91.11.20) mapping precisely to this classification.

Over the decade, the EU's total trade in this product grew substantially — both imports and exports increased in value terms — yet the dynamics behind this headline growth reveal a complex story of shifting partner reliance, diverging unit values, a dramatic contraction of EU production volumes, and a fundamental reorientation of the EU's export landscape. The following sections examine these dynamics in turn.

1. A Structural Deficit Deepening Through Volume-Led Import Growth

1.1 The trade balance has deteriorated despite rising export values

Between 2015 and 2025, the EU's trade in diamond grinding wheels recorded significant nominal growth on both sides of the ledger. Exports rose from €221.7 million to €292.2 million (+31.8%), while imports climbed from €232.4 million to €317.3 million (+36.5%). However, the trade deficit widened from €10.7 million to €25.1 million. The maximum deficit during the period reached €31.5 million, while in one year the EU briefly achieved a surplus of €3.1 million, underscoring the volatility of the balance.

The faster pace of import growth relative to exports is a defining feature of this period. Import value grew at roughly 36%, while export value grew at roughly 32%, meaning that the EU's net dependence on external suppliers has, in nominal terms, increased.

1.2 Import volume growth far outpaces export volume growth, at falling prices

The most revealing structural insight emerges from the volume and price decomposition. EU import quantities surged from 9,692 tonnes to 13,859 tonnes (+43.0%), while export quantities grew more modestly from 5,321 tonnes to 6,296 tonnes (+18.3%). Crucially, import prices declined by 4.5% (from €23,972/t to €22,889/t), whereas export prices increased by 11.4% (from €41,650/t to €46,379/t).

This divergence — high-volume, low-price imports growing faster than low-volume, high-price exports — is highly characteristic of a product where the EU occupies the premium segment. EU manufacturers appear to specialise in higher-specification diamond grinding wheels (for precision applications in automotive, aerospace and semiconductor manufacturing), while cheaper commodity-grade products increasingly flow in from Asia. The EU's export unit value is roughly double that of its imports, consistent with a quality and technology premium.

1.3 China drives import growth while Russia's collapse reshapes exports

The partner-level data reveals dramatic shifts in the geography of trade. On the import side, China stands out as the dominant growth engine:

China alone accounted for nearly half of all EU imports in 2025, up from roughly 40% in 2015. Ukraine experienced explosive growth (+520%), albeit from a low base, potentially reflecting post-2022 diversification and geopolitical supply-chain adjustments. Korea is the only top partner to have declined, suggesting competitive displacement by Chinese suppliers.

On the export side, the most dramatic story is the collapse of exports to Russia:

Exports to Russia fell by 69%, almost certainly a consequence of EU sanctions following the 2022 invasion of Ukraine. This lost market was more than offset by surging exports to the United States (+91.6%), which nearly doubled and became by far the EU's largest single export destination at €71.4 million. Türkiye (+79.7%) and Liechtenstein (+69.7%) also grew strongly. The picture is one of significant geographic reorientation, from East to West.

2. A European Industry Retreating from Volume While Climbing the Value Chain

2.1 EU production volume has collapsed, but output value has barely changed

Perhaps the most striking finding in the data concerns EU production. Reported production quantities fell from 20,000 kg to just 5,000 kg — a 75% decline — while production value edged up from €258.1 million to €276.0 million (+6.9%). These two trends are not contradictory: they point to a European industry that has moved decisively into higher-value-added, lower-volume products.

This is consistent with the trade data showing that EU export unit values are roughly double those of imports. European manufacturers — concentrated in Italy, Germany, Austria and Sweden — appear to have ceded commodity-grade production to Asian competitors while focusing on precision-engineered, application-specific diamond tools. This strategy preserves value even as volumes contract, but it also implies growing structural import dependence for lower-tier products.

2.2 Italy leads a concentrated set of EU producing and exporting nations

The specialisation data for 2025 highlights which EU member states have a revealed comparative advantage in diamond grinding wheels:

Austria displays the highest relative specialisation (RSCA of 0.73), with a disproportionately large share of production relative to its overall industrial base. Germany holds the largest absolute production share (30.6%) but lower specialisation, reflecting the breadth of its manufacturing sector. Italy is the EU's largest exporter, shipping €124.3 million in 2025 (+37.9% vs. 2015), and accounts for a dominant share of EU production value.

2.3 Sweden and Hungary emerge as fast-growing EU exporters

While Italy and Germany remain the largest exporters, the fastest growth in EU export capacity came from newer or previously minor players. Sweden's exports surged from €7.0 million to €22.1 million (+213%), Hungary's from €7.8 million to €16.1 million (+106%), and Bulgaria's from €6.1 million to €10.2 million (+66%).

Sweden's tripling of exports may reflect the country's strong position in precision tooling (companies such as Sandvik and similar), while Hungary and Bulgaria's growth likely reflects Central and Eastern European industrial integration and lower-cost manufacturing platforms within the EU single market. Germany and Austria, by contrast, saw only marginal export growth (+2.6% each), suggesting mature markets with limited additional capacity.

3. Shifting Vulnerabilities: From Import Dependence to Export Diversification

3.1 Net import reliance has fallen sharply despite rising import volumes

Paradoxically, while the absolute trade deficit widened, the EU's net import reliance as a share of apparent consumption declined from 13.9% to 4.9% (−65.1%). At one point during the period, this metric even turned briefly negative (−3.0%), meaning the EU temporarily became a net exporter in consumption-share terms.

Simultaneously, trade intensity — total trade (exports + imports) as a share of production — rose from 64.0% to 105.8%, meaning the EU now trades more than it produces. The most dramatic shift is in export propensity, which soared from 42.8% to 112.5% (+163%). This indicates that EU exports now exceed domestic production — a pattern consistent with the EU serving as an export platform, potentially re-exporting processed or finished goods assembled from imported components, or with significant intra-firm trade.

3.2 Import concentration has risen, driven by China's dominance

The Herfindahl-Hirschman Index (HHI) for import concentration increased from 2,114 to 2,530 (+19.7%), moving the market from a moderately concentrated structure into more firmly concentrated territory. This is almost entirely attributable to China's growing share. By contrast, export concentration remains much lower (HHI rising modestly from 690 to 891), reflecting the EU's diversified customer base across the Americas, Europe and emerging markets.

The rising import concentration represents a growing vulnerability. The EU's increasing reliance on Chinese suppliers — from €94.0 million to €148.0 million — creates a single-point-of-failure risk in the event of trade disruptions, export controls or geopolitical tensions. China's dominance at the commodity end of the market, combined with falling Chinese export prices, makes it difficult for alternative suppliers to compete, reinforcing the concentration trend.

3.3 Supply shocks and price volatility vary significantly by partner

The volatility analysis reveals that certain trade corridors are far more volatile than others. Among import partners, China shows relatively low volatility (coefficient of variation of 0.19), confirming its role as a stable, volume-driven supplier. By contrast, imports from Ukraine (CV 0.39) and Vietnam (CV 0.95) are highly volatile, suggesting episodic or opportunistic trade flows.

Among export partners, the most stable relationships are with Switzerland (CV 0.07) and the United Kingdom (CV 0.18), both geographically proximate and economically integrated. The most volatile export corridors include Algeria (CV 0.77), Iran (CV 0.61) and India (CV 0.51), where trade volumes fluctuate significantly year to year.

The data also detects notable supply shocks, including a 236.5% price spike in EU exports to Egypt in 2018 and a 234.7% price surge to India in 2017. These extreme events, while small in overall value share, highlight the fragility of trade with certain emerging markets and the potential for sudden price dislocations.

Conclusion

The EU's diamond grinding wheel market (CN 680421) has undergone a profound structural transformation between 2015 and 2025. Trade volumes and values have grown on both the import and export sides, but the underlying dynamics reveal a European industry that is retreating from commodity production while consolidating its position in high-value segments. EU production volumes fell by 75%, yet output value held steady, and export unit values now run at roughly double import prices.

The geographic centre of gravity has shifted markedly. China has tightened its grip on EU imports, driving rising concentration and exposing the bloc to supplier-dependence risks. On the export side, the collapse of trade with Russia — a consequence of EU sanctions — has been more than compensated by surging demand from the United States, Türkiye and other Western-aligned markets. The EU's net import reliance has declined from 14% to under 5%, while export propensity has more than doubled, pointing to an industry that increasingly looks outward.

Key risks going forward include: (1) the growing concentration of imports around China, which may prove politically and economically vulnerable; (2) the continued erosion of commodity-grade production within the EU, increasing dependence on external suppliers for standard products; and (3) price volatility in emerging-market export corridors. However, the EU's demonstrated ability to move up the value chain, its diversified export base, and the strong performance of fast-growing member-state exporters such as Sweden, Hungary and Bulgaria suggest a sector that retains considerable competitive resilience in its premium niche.