(paulzimnisky.com) - Coming off of 2017, a year in which global diamond supply by volume increased by 11.7% year-over-year, supply is forecast to contract by 3.4% to 147M carats in 2018 (see appendix at bottom for itemized analysis by mine). Out of the world's top three diamond miners by volume, only De Beers is expected to increase production this year, while diamond output at Russia's ALROSA (MICEX: ALRS) and diversified-major Rio Tinto (LSE: RIO) is estimated to decline, more than offsetting De Beers' increase. Combined, the three companies represent approximately 70% of global diamond supply by volume.
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