Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter. The four Cs — colour, cut, clarity and carat, a system invented by DeBeers in 1939 — guide the pricing of ...
Appraiser Katherine Van Dell mentioned “treated” emeralds in her appraisal of a beautiful circa 1900 emerald and diamond ring. What enhancements are performed on stones? And how do untreated gemstones ...
The international gem trade can be a shady business. In a quiet corner of a busy London pub, a trader, who asked to remain anonymous, tells C&EN about passing off synthetic gems, made in a ...
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