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Nothing concentrates such a high value in such a small space and is at the same time as timeless as a cut diamond. Rough stones are cut in various centers all over the world, the largest on 47th Street in New York. The entire North American diamond trade is concentrated here on the "Diamond Way". The prices for high-carat diamonds are rising, as the recent record auctions by Christie's and Sotheby's have shown. The largest stone, weighing over 100 carats, brought in almost 18 million francs. - The oldest private gemstone laboratory specializing in testing colored stones is based in Lucerne. Subscribe to NZZ Format: https://goo.gl/Fy28as