Gem Diamonds’ Letšeng revenue lift: production and value drivers for mine planners
Reviewed by Tom Sullivan
First reported on MINING.com
30 Second Briefing
Gem Diamonds reported quarterly revenue of $32.1 million as sales of large high-value stones from the Letšeng mine offset a 21% drop in carats sold to 16,727 and weaker sector-wide pricing. The first export sale averaged $1,501 per carat, up 17% quarter-on-quarter, with a separate parcel of ten +10.8-carat stones, including a 191.82-carat Type IIa white diamond, adding $7 million. Letšeng treated 1.33 million tonnes of ore (down 3%) and recovered 21,605 carats (up 3%), with production weighted to the lower-grade Main Pipe but still yielding two +100-carat stones.
Technical Brief
- Four individual stones exceeded $1 million each, together contributing $9.9 million of quarterly revenue.
- The top price achieved was $32,908/ct for a 52.24-ct white diamond from Letšeng.
- A separate parcel of ten +10.8-ct diamonds generated $7 million, sold outside the main export tender.
- Remaining production from that special parcel is held back for sale in Q2, smoothing revenue timing.
- Two +100-ct stones were recovered: a 191.82-ct Type IIa white and a 100.71-ct faint yellow.
- Mine plan currently biases extraction to the lower-grade Main Pipe, reducing Satellite Pipe contribution.
- Despite a 3% quarter-on-quarter reduction in ore treated to 1.33 Mt, carats recovered increased by 3%.
- All operational and financial metrics at Letšeng are reported as tracking within 2026 guidance ranges.
Our Take
Letšeng’s reliance on a handful of +10.8 ct stones for $7 million of revenue underlines how revenue volatility at niche diamond operations is driven more by size-frequency distribution than by throughput, which only fell 3% in ore treated this quarter.
In our database of 1183 Mining stories, diamond pieces like this are far less common than copper or battery-metal items, signalling that Gem Diamonds’ performance sits in a thinner peer set where investor comparisons are often made against luxury demand rather than bulk commodity cycles.
Codelco’s plan to unlock a $2 billion gain from unifying Chilean copper mines, alongside Chile’s push to accelerate permits, contrasts with Gem Diamonds’ Lesotho exposure by highlighting how capital and policy attention in the region are skewed toward large-scale base metals rather than high-value, low-tonnage diamond assets.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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