Brett Kosnar of Beija Flor Wholesale with a 24.26-carat round, Portuguese-cut rhodochrosite Anthony DeMarco Second Place: Ruben Bindra of B & B Fine Gems with a 6.49-carat square East African ...

A 55.22-carat ruby has become both the largest and most valuable gem of its kind ever to sell at auction, netting $34.8 million on Thursday.. The stone went under the hammer in New York in June ...

The mastery of stone is one of the most impressive features of Portuguese architecture. From the precise cut in fittings to ... that-explore-how-architects-use-portuguese-stone> ISSN 0719 ...