Last month, for the first time since since mid-2008, the company didn't see a decline in any of the polished diamond categories that it monitors and buys, Gannicott said.
As far as rough diamonds are concerned, there was evidence earlier this year that the decline in demand and prices had stalled, particularly for items that could be quickly turned into polished diamonds for jewellery like engagement and wedding rings.
Last month, demand was further improved across all categories, and there was also signs of increasing prices, Gannicott said.
'“Is this a bottom? We would love to think so. If it is not a bottom, it is certainly a plateau,” he said.
https://www.miningweekly.com/article/if-not-a-bottom-then-a-plateau-harry-winston-on-diamonds-2009-04-03