Declining ruby grades, illegal mining and other challenges will weigh on Gemfields’ production, quality mix and cash flow for the full year. Ore grade for premium rubies at the Montepuez mine in Mozambique has fallen by half, the company said Monday. The number of carats of rubies per tonne dropped to 0.03 between January and May of 2026 from 0.06 in the full year of 2025. In addition to the declining grades, the company has not been able to min…
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