The work of Tobias Lanz, head buyer of diamonds for Bucherer Fine Jewellery, can be carried out on the international gemstone markets of Hong Kong, Mumbai and Tel Aviv. The trained gemmologist travels there at regular intervals. However, he can usually be found in his office at the Bucherer headquarters in Lucerne, where he has access to around 1.5 million stones via trading platforms on his computer. The selection seems extensive, yet less than one per cent of these stones will meet the stringent standards of quality demanded by Bucherer Fine Jewellery. Although modern technology makes it possible for Tobias Lanz to assess diamonds online, the expert first always has to see them with his own eyes before sealing the deal. “Bucherer Fine Jewellery receives every stone we consider buying beforehand to be tested,” explains Tobias Lanz. “We have an excellent reputation in the industry and longstanding relationships of mutual trust with the best diamond suppliers.” The diamond business has always been a trust-based one. Nowadays, the mazal – the typical phrase used to close a diamond deal, traditionally accompanied by a handshake – is usually simply sent by e-mail, according to Tobias Lanz.