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The shadowy world of gemstones

Rubies, emeralds and sapphires were once much more valuable than diamonds – or so says their chief modern proponent.

Alex Hamer
Almost a handful: rubies from Gemfields' Montepuez mine in Mozambique

Almost a handful: rubies from Gemfields' Montepuez mine in Mozambique

Diamonds had the backing of a major advertising campaign early in the 20th century that popularised engagement rings and then a meticulous supply system from DeBeers kept retail prices up.  In recent...

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