Diamonds are Forever?

Lending ONE BILLION against some baubles supposed to be in envelopes or safes? NUTS! Did they never hear about the Great Salad Oil Swindle in the early 1960's? What do these risk managers do? Do the 'Elite' Business Schools teach them the basics?
https://www.bloomberg.com//news/articles/2017-09-07/how-standard-chartered-lost-400-million-on-risky-diamond-debt