Petra Diamonds Q3 Revenue Rises 64% to $68 Million; Blue Diamond Drives Cullinan Outperformance

Executive Summary

Petra Diamonds' third fiscal quarter (ending March 31, 2026) produced a significant jump in reported revenue, well above the prior-year period. The result was driven by stronger production volumes, an exceptional blue diamond transaction, and an improved product mix at the Cullinan mine—all occurring against a backdrop of weak underlying rough market pricing. Total sales reached $68 million, up 64% year-on-year from $42 million. Carats sold were 781,797, up 40% year-on-year and 58% quarter-on-quarter. Average price was $87 per carat, down 11% quarter-on-quarter. Cullinan mine revenue rose 117%; Finsch mine sales fell 5%. Like-for-like prices across all sizes were down 15%—confirming that volume and mix shift, not market price recovery, drove the headline gain. Petra sold a 41.82-carat Type IIb blue diamond recovered from Cullinan in December 2025 and retains a significant economic interest in the expected polished profit within approximately 12 months. The Cullinan-Finsch divergence reflects a structural reality: high-value rare stones at Cullinan are disproportionate value drivers, while Finsch's commodity-grade small goods face the same headwinds as the broader rough market. The 15% like-for-like price decline confirms that market stabilization is not yet filtering into transaction-level pricing for mainstream rough categories.

Industry Impact

The 15% like-for-like price decline at Petra is a strong signal that rough market pricing remains under pressure even as headline production volumes recover. Rough buyers should note that producer headline sales figures can be distorted by exceptional stones; underlying market pricing for mainstream goods is weaker than top-line numbers suggest. The Cullinan blue diamond highlights the continued premium for top-quality Type II goods, where supply constraints persist and pricing power remains with the seller.

Next Steps

1. Review purchasing budgets for Cullinan-origin large specials: Petra's retained polished interest model may signal a broader shift toward structured upside arrangements for exceptional stones.
2. Adjust rough price forecasting to reflect the 15% like-for-like decline confirmed in Petra's Q3—this is a current-period data point.
3. Monitor Finsch pricing trajectory; if pricing holds at floor, expect further production guidance adjustments.
4. For polished dealers in 5-carat-and-above goods, track the Cullinan blue diamond's polished sale—expected within 12 months, it will be a pricing benchmark.
5. Evaluate Petra rough parcel composition (mainly small goods from Finsch) against current polished margins before the next bidding cycle.